# Health3 > Health3 is a blood-work tracking app that decodes lab reports, explains each biomarker, and tracks results over time. The pages below are available as clean Markdown for AI agents by appending `.md` to any listed URL. ## Blog Long-form guides on blood tests, biomarkers, and how to read lab results. - [B Vitamins Blood Test Guide: B1, B5, B6, B7, B9, B12 and What Your Levels Mean](https://www.health3.app/blog/b-vitamins-blood-test-guide.md): A comprehensive guide to B vitamin blood tests covering B1 (thiamine), B5 (pantothenic acid), B6 (pyridoxine), B7 (biotin), B9 (folate), and B12 (cobalamin). Learn normal ranges, deficiency symptoms, and what elevated homocysteine means for your health. - [Biomarker Interactions: Why Looking at One Number Isn't Enough](https://www.health3.app/blog/biomarker-interactions-explained.md): Learn why interpreting biomarkers in isolation can be misleading. This guide explores key interactions between vitamin D and calcium, the iron panel, the thyroid axis, and B vitamins with homocysteine—so you can understand your lab results more fully. - [Blood Sugar Markers Explained: Fasting Glucose, HbA1c, Fasting Insulin](https://www.health3.app/blog/blood-sugar-markers-explained.md): An in-depth guide to the three key blood sugar markers: fasting glucose, HbA1c, and fasting insulin. Learn optimal ranges, what abnormal values signal, how HOMA-IR is calculated, and practical steps to improve metabolic health. - [Blood Tests for Inflammation: CRP, ESR, and What Elevated Markers May Indicate](https://www.health3.app/blog/blood-tests-for-inflammation.md): Learn what CRP, hs-CRP, ESR, and homocysteine measure, their normal ranges, and what chronically elevated levels may signal. Understand how these inflammation markers are used together to assess cardiovascular and autoimmune risk. - [Complete Blood Count (CBC) Explained: What Each Value Means](https://www.health3.app/blog/complete-blood-count-cbc-explained.md): A detailed guide to the complete blood count (CBC). Learn what WBC, RBC, hemoglobin, hematocrit, MCV, MCH, MCHC, and platelet values measure, their normal ranges, and what abnormal results may indicate. - [Fasting Before Blood Tests: What You Need to Know](https://www.health3.app/blog/fasting-blood-tests-guide.md): Find out which blood tests require fasting, how long you need to fast, what you can drink, and practical tips to make fasting more comfortable. Includes a test-by-test reference table for the most common panels. - [How Often Should You Get Blood Work Done? An Evidence-Based Guide](https://www.health3.app/blog/how-often-should-you-get-blood-work.md): An evidence-based guide to blood test frequency. Learn age-specific recommendations for healthy adults, how chronic conditions change testing schedules, the value of tracking trends over time, and how to use the Health3 blood test frequency tool. - [How to Read Your Blood Test Results: A Complete Guide](https://www.health3.app/blog/how-to-read-blood-test-results.md): Learn how to read and understand your blood test results. This complete guide covers the CBC, comprehensive metabolic panel, lipid panel, and thyroid panel with normal ranges and what abnormal values mean. - [The Complete Blood Test Guide: Every Test Explained, From CBC to Hormones](https://www.health3.app/blog/complete-blood-test-guide.md): The definitive guide to blood testing. Covers every major panel—CBC, CMP, lipid panel, iron panel, thyroid, vitamins, hormones, and inflammatory markers—with normal ranges, preparation tips, result-reading advice, and how often each test should be done. - [The Iron Panel Blood Test: Iron, Ferritin, TIBC, and Transferrin Saturation](https://www.health3.app/blog/iron-panel-blood-test-guide.md): Learn how to interpret a complete iron panel. This guide explains serum iron, ferritin, TIBC, and transferrin saturation, how they relate to each other, and how to recognize the stages of iron deficiency from depleted stores to frank anemia. - [Thyroid Blood Tests Explained: TSH, Free T3, Free T4](https://www.health3.app/blog/thyroid-blood-tests-explained.md): A deep-dive guide to thyroid blood tests. Learn how TSH, free T3, and free T4 work together to regulate metabolism, what normal ranges look like, and how to interpret abnormal results for hypothyroidism or hyperthyroidism. - [Understanding Ferritin Levels: Why This Iron Marker Matters](https://www.health3.app/blog/ferritin-levels-guide.md): A detailed guide to serum ferritin—what it measures, why low ferritin matters even without anemia, how inflammation falsely elevates ferritin, and what both low and high results can mean for your health. - [Understanding Hormone Blood Tests: Cortisol, DHEA-S, Testosterone, and More](https://www.health3.app/blog/understanding-hormones-blood-test.md): A practical guide to understanding common hormone blood tests including cortisol, DHEA-S, free and total testosterone, and FSH. Learn what each measures, how to interpret your results, and why timing and context matter. - [Understanding Your Cholesterol Blood Test: LDL, HDL, Triglycerides](https://www.health3.app/blog/understanding-cholesterol-blood-test.md): A deep dive into your cholesterol blood test. Learn what LDL, HDL, triglycerides, and total cholesterol values mean, optimal ranges, important ratios, and what steps to take when levels are outside the healthy zone. - [Vitamin D Levels: 2026 Guidelines & Reference Ranges](https://www.health3.app/blog/vitamin-d-optimal-levels.md): Educational 2026 guide to vitamin D reference ranges, units, and major guideline differences. For context only—not diagnosis or personal medical advice. - [Why "Normal" Blood Test Results Don't Always Mean You're Healthy](https://www.health3.app/blog/normal-blood-test-results-not-optimal.md): Your blood test came back 'normal' but you still feel off. Learn why standard lab reference ranges can miss early warning signs, and how optimal ranges reveal what your body really needs. ## Biomarkers Reference pages for individual blood biomarkers: what they mean and typical ranges. - [Blood Glucose](https://www.health3.app/biomarkers/bloodgluco.md): Plasma glucose, commonly known as blood sugar, is a primary energy source for the body's cells and is critical for normal bodily function. It is particular - [Calcium](https://www.health3.app/biomarkers/calcium.md): Calcium, a crucial mineral in the blood, is fundamental for several vital body functions. It is best known for its role in bone health, where it helps in t - [Copper (Free)](https://www.health3.app/biomarkers/copper_free.md): Copper, a trace mineral in the blood, is crucial for various bodily functions. It plays a key role in iron metabolism, aiding in the formation of red blood - [Copper (Total)](https://www.health3.app/biomarkers/copper_total.md): Copper, a trace mineral in the blood, is crucial for various bodily functions. It plays a key role in iron metabolism, aiding in the formation of red blood - [DHEAS](https://www.health3.app/biomarkers/dheas.md): Dehydroepiandrosterone sulfate (DHEAS) is a steroid hormone produced primarily by your adrenal glands that serves as a precursor to both male and female se - [Ferritin](https://www.health3.app/biomarkers/ferritin.md): Ferritin is often called the body's - [Follicle-stimulating hormone (FSH)](https://www.health3.app/biomarkers/fsh.md): Follicle-stimulating hormone (FSH) is a critical reproductive hormone produced by the pituitary gland that plays essential roles in fertility and sexual de - [Free Serum Cortisol](https://www.health3.app/biomarkers/cortisol_free_serum.md): Cortisol, often referred to as the - [Free Testosterone](https://www.health3.app/biomarkers/freetestos.md): Testosterone is a vital male sex hormone, also present in women in smaller amounts, crucial for various bodily functions. In men, testosterone plays a key - [Free Thyroxine (FT4)](https://www.health3.app/biomarkers/ft4.md): FT4 (free thyroxine) measures the unbound fraction of T4. Reference range, units (ng/dL, pmol/L, pg/mL), pg/mL to pmol/L conversion, and how the test works. - [Free Triiodothyronine (FT3)](https://www.health3.app/biomarkers/ft3.md): FT3 is the active thyroid hormone available to your cells. Your body makes some T3 directly but also converts T4→T3 inside tissues. FT3 is the active form - [Holotranscobalamin](https://www.health3.app/biomarkers/holotransc.md): Holotranscobalamin represents the fraction of vitamin B12 that is bound to transcobalamin, which is the transport protein that delivers B12 to cells. HoloT - [Homocysteine](https://www.health3.app/biomarkers/homocystei.md): Homocysteine is an amino acid in the blood that's a byproduct of protein metabolism. Elevated levels of homocysteine, known as hyperhomocysteinemia, have b - [IGF-I](https://www.health3.app/biomarkers/igfi.md): Insulin-like Growth Factor 1 (IGF-I) is a hormone similar in molecular structure to insulin and plays a crucial role in childhood growth and continues to h - [Insulin (Fasting)](https://www.health3.app/biomarkers/insulinfas.md): Insulin, a hormone produced by the pancreas, plays a crucial role in regulating blood glucose levels by facilitating the uptake of glucose into cells for e - [Iron](https://www.health3.app/biomarkers/iron.md): Iron is essential for producing hemoglobin in red blood cells, which carries oxygen throughout the body. It's crucial for energy production, muscle functio - [Magnesium](https://www.health3.app/biomarkers/magnesium.md): Magnesium in the blood is essential for numerous body functions. It plays a critical role in over 300 enzyme reactions, including those involved in energy - [Potassium](https://www.health3.app/biomarkers/potassium.md): Potassium, a vital mineral and electrolyte in the body, plays a key role in several critical bodily functions. At optimal levels, it is essential for maint - [Selenium](https://www.health3.app/biomarkers/selenium.md): Selenium is a trace mineral that plays a critical role in the body, primarily as a component of antioxidant enzymes. These enzymes protect cells from damag - [Sodium](https://www.health3.app/biomarkers/sodium.md): Sodium as a blood biomarker significantly influences several bodily functions. When maintained within its physiological range, sodium ensures proper nerve - [Soluble Transferrin Receptor (sTfR)](https://www.health3.app/biomarkers/stfr.md): Soluble transferrin receptor (sTfR) reference ranges and clinical use on the anemia panel. Distinguishes iron-deficiency anemia from anemia of chronic disease via the sTfR / log-ferritin (Thomas) index. - [Thyroid-Stimulating Hormone (TSH)](https://www.health3.app/biomarkers/tsh.md): TSH is a hormone made by your pituitary gland (in the brain). It tells your thyroid to make thyroid hormones (T4 and T3). When T4/T3 are low, TSH usually g - [Total Serum Cortisol](https://www.health3.app/biomarkers/cortisol_total_serum.md): Cortisol, often referred to as the - [Total Testosterone](https://www.health3.app/biomarkers/totaltesto.md): Testosterone is a vital male sex hormone, also present in women in smaller amounts, crucial for various bodily functions. In men, testosterone plays a key - [Vitamin A](https://www.health3.app/biomarkers/vitamina.md): Vitamin A, a fat-soluble vitamin, is essential for various critical bodily functions. It is crucial for maintaining healthy vision, particularly night visi - [Vitamin B1 (Thiamine) in Whole Blood](https://www.health3.app/biomarkers/vitaminb1t.md): Vitamin B1, also known as thiamine, is an essential nutrient that plays a crucial role in energy metabolism, particularly in the conversion of carbohydrate - [Vitamin B12 (Cobalamin)](https://www.health3.app/biomarkers/vitaminb12.md): Vitamin B12, or cobalamin, is crucial for red blood cell formation, nerve function, and DNA synthesis. It's vital for maintaining healthy nerve cells and t - [Vitamin B5 (Pantothenic Acid)](https://www.health3.app/biomarkers/vitaminb5p.md): Vitamin B5, also known as pantothenic acid, is essential for human health, playing a central role in energy metabolism by aiding in the breakdown of carboh - [Vitamin B6 (Pyridoxine)](https://www.health3.app/biomarkers/vitaminb6p.md): Vitamin B6, also known as pyridoxine, is a crucial nutrient that plays a significant role in a wide range of bodily functions. It is essential for protein - [Vitamin B7 (Biotin)](https://www.health3.app/biomarkers/vitaminb7b.md): Biotin, also known as vitamin B7 or vitamin H, is a water-soluble B-vitamin crucial in metabolizing fats, carbohydrates, and amino acids. It is essential f - [Vitamin B9 (Folate) in Plasma](https://www.health3.app/biomarkers/vitaminb9_plasma.md): Folate, also known as Vitamin B9 or folic acid in its synthetic form, is vital for DNA synthesis, repair, methylation, and red blood cell production. It's - [Vitamin B9 (Folate) in RBC](https://www.health3.app/biomarkers/vitaminb9_rbc.md): Folate, also known as Vitamin B9 or folic acid in its synthetic form, is vital for DNA synthesis, repair, methylation, and red blood cell production. It's - [Vitamin C](https://www.health3.app/biomarkers/vitaminc.md): Vitamin C, also known as ascorbic acid, is a crucial nutrient for human health, renowned for its role as a powerful antioxidant. It's essential for the syn - [Vitamin D (25-OH)](https://www.health3.app/biomarkers/vitamind25.md): Vitamin D, specifically 25-hydroxyvitamin D (25-OH vitamin D), is vital for bone health, aiding in calcium and phosphorus absorption, and plays a role in r - [Vitamin K](https://www.health3.app/biomarkers/vitamink.md): Vitamin K is a fat-soluble vitamin crucial for blood clotting and bone health. It exists in two primary forms: Vitamin K1 (phylloquinone), found predominan - [Zinc](https://www.health3.app/biomarkers/zinc.md): Zinc is essential for various bodily functions, including immune response, wound healing, DNA synthesis, cell division, and enzyme activity. It's crucial f ## Tools Free clinical calculators and converters for blood-work values. - [Anion Gap Calculator](https://www.health3.app/tools/anion-gap-calculator.md): Free anion gap calculator from sodium, chloride, and bicarbonate, with optional potassium and albumin correction. Published reference ranges shown. - [Blood Pressure Reference Tool](https://www.health3.app/tools/blood-pressure-category-checker.md): See where your blood pressure reading sits versus AHA 2017 and ESC/ESH 2023 reference cutoffs. Wellness reference, not a diagnostic tool. - [Blood Test Frequency Recommender](https://www.health3.app/tools/blood-test-frequency.md): Find out how often you should get blood work done based on your age, sex, and health profile. Personalized blood test frequency recommendations backed by AHA and USPSTF guidelines. - [Blood Test Preparation Checklist](https://www.health3.app/tools/blood-test-prep-checklist.md): Get a personalized blood test preparation checklist based on your specific tests. Learn how to prepare for blood work including fasting, hydration, medications, and what to bring. - [Blood Test Unit Converter](https://www.health3.app/tools/blood-test-unit-converter.md): Free blood test unit converter for 60+ biomarkers. Convert mg/dL, mmol/L, µmol/L, ng/dL and more instantly, with formulas and no sign-up. - [BMI Calculator](https://www.health3.app/tools/bmi-calculator.md): Free BMI calculator: calculate your Body Mass Index instantly with metric or imperial units. See your WHO category, healthy weight range, and visual BMI scale. No sign-up required. - [Body Fat Percentage Calculator](https://www.health3.app/tools/body-fat-percentage-calculator.md): Free body fat percentage calculator using the US Navy circumference method. Get BF% with category badge (essential, athlete, fitness, average, obese) and ACE/ACSM context. - [Cholesterol Ratio Calculator](https://www.health3.app/tools/cholesterol-ratio-calculator.md): Calculate Total/HDL, LDL/HDL, and TG/HDL ratios with reference cutoffs. Wellness reference, not a diagnostic tool. - [Corrected Calcium Calculator](https://www.health3.app/tools/corrected-calcium-calculator.md): Free albumin-corrected calcium calculator using the Payne 1973 formula. Adjust total serum calcium for low or high albumin. Inputs in mg/dL or mmol/L. - [eAG Calculator](https://www.health3.app/tools/eag-calculator.md): Free eAG calculator. Convert your HbA1c to estimated average glucose (mg/dL and mmol/L) using the ADAG study formula. See the ADA diagnostic categories. - [eGFR Reference Tool (CKD-EPI 2021 Race-Free)](https://www.health3.app/tools/egfr-calculator.md): Estimate kidney function from serum creatinine using the 2021 race-free CKD-EPI equation. Wellness reference, not a diagnostic tool. - [Fasting Timer for Blood Tests](https://www.health3.app/tools/fasting-timer.md): Free fasting timer for blood tests. Set your appointment time, get a countdown, and know exactly when to stop eating. Covers lipid panels, glucose, metabolic panels, and more. - [Ferritin Level Interpreter](https://www.health3.app/tools/ferritin-level-interpreter.md): Enter your ferritin level to see where your value sits versus general reference ranges by sex and age. A wellness reference, not a diagnostic tool. - [FFMI Calculator](https://www.health3.app/tools/ffmi-calculator.md): Free FFMI calculator for trained lifters. Enter weight, height, body fat and sex to get Fat-Free Mass Index and the Kouri height-normalized FFMI, with reference bands drawn from published bodybuilding research. - [FIB-4 Calculator](https://www.health3.app/tools/fib-4-calculator.md): Free FIB-4 calculator. Compute the Fibrosis-4 index from age, AST, ALT, and platelet count, with the published Sterling 2006 reference cutoffs. - [Free Testosterone Calculator](https://www.health3.app/tools/free-testosterone-calculator.md): Free testosterone calculator using the Vermeulen equation from total testosterone, SHBG, and albumin. Estimates calculated free and bioavailable testosterone. - [HbA1c to Average Glucose Converter](https://www.health3.app/tools/hba1c-glucose-converter.md): Free HbA1c converter: switch between %, mmol/mol, and average glucose (mg/dL or mmol/L). See if your A1c falls in the normal, prediabetes, or diabetes range. - [Heart Rate Zone Calculator](https://www.health3.app/tools/heart-rate-zone-calculator.md): Free Zone 2 and 5-zone heart rate calculator. Karvonen, Tanaka and HUNT formula options. Enter your age and resting HR to get personalised training zones in BPM with talk-test guidance. - [HOMA-IR Reference Tool](https://www.health3.app/tools/homa-ir-calculator.md): Estimate your HOMA-IR insulin sensitivity score from fasting glucose and insulin. Wellness reference, not a diagnostic tool. - [Lab Test Abbreviation Lookup](https://www.health3.app/tools/lab-test-abbreviations.md): Look up 100+ lab test abbreviations instantly. Find out what CBC, TSH, ALT, HbA1c, BUN, eGFR, CRP, and other blood test acronyms mean with clear, accurate descriptions. - [LDL Cholesterol Calculator](https://www.health3.app/tools/ldl-cholesterol-calculator.md): Free LDL cholesterol calculator using the Sampson-NIH 2020 equation, with the Friedewald estimate shown side by side. Inputs in mg/dL or mmol/L. - [Lipid Panel Reference Tool](https://www.health3.app/tools/lipid-panel-interpreter.md): See where each lipid panel component sits versus general reference ranges. Wellness reference, not a diagnostic tool. - [Macronutrient Calculator](https://www.health3.app/tools/macro-calculator.md): Free macronutrient calculator: find out how much protein, carbs, and fat you need daily based on your body, activity level, and fitness goal. Uses the Mifflin-St Jeor equation. - [Mean Arterial Pressure (MAP) Calculator](https://www.health3.app/tools/mean-arterial-pressure-calculator.md): Calculate MAP and pulse pressure from systolic and diastolic readings. Wellness reference, not a diagnostic tool. - [Non-HDL Cholesterol Calculator](https://www.health3.app/tools/non-hdl-cholesterol-calculator.md): Free non-HDL cholesterol calculator. Subtract HDL from total cholesterol to get non-HDL-C, with published reference goals. Inputs in mg/dL or mmol/L. - [Remnant Cholesterol Calculator](https://www.health3.app/tools/remnant-cholesterol-calculator.md): Free remnant cholesterol calculator. Compute remnant cholesterol as total cholesterol minus HDL minus LDL, with published reference context. mg/dL or mmol/L. - [Sleep Cycle Calculator](https://www.health3.app/tools/sleep-calculator.md): Free sleep cycle calculator. Find the best time to go to bed or wake up based on 90-minute sleep cycles. Wake up refreshed by aligning with your natural sleep rhythms. - [TDEE Calculator](https://www.health3.app/tools/tdee-calculator.md): Free TDEE calculator using the Mifflin-St Jeor equation. Find out how many calories you burn per day based on your age, weight, height, and activity level. - [TG/HDL Ratio Calculator](https://www.health3.app/tools/tg-hdl-ratio-calculator.md): Free triglyceride-to-HDL (TG/HDL) ratio calculator. Compute the ratio from your lipid panel, with published reference context. Inputs in mg/dL or mmol/L. - [Thyroid Panel Reference Tool](https://www.health3.app/tools/thyroid-panel-interpreter.md): See where your TSH, Free T4 and Free T3 values sit versus general reference ranges. Wellness reference, not a diagnostic tool. - [Transferrin Saturation Reference Tool](https://www.health3.app/tools/iron-saturation-calculator.md): Calculate transferrin saturation from serum iron and TIBC. Wellness reference, not a diagnostic tool. - [TyG Index Calculator](https://www.health3.app/tools/tyg-index-calculator.md): Free TyG index calculator. Compute the triglyceride-glucose index from fasting triglycerides and glucose, with mg/dL and mmol/L inputs and published reference context. - [Uric Acid Level Reference Tool](https://www.health3.app/tools/uric-acid-level-interpreter.md): See where your serum uric acid sits versus general sex-specific reference ranges. Wellness reference, not a diagnostic tool. - [Vitamin B12 Level Reference Tool](https://www.health3.app/tools/vitamin-b12-level-interpreter.md): See where your B12 (and optional MMA/holoTC) values sit versus general reference ranges. Wellness reference, not a diagnostic tool. - [Vitamin D Level Reference Tool](https://www.health3.app/tools/vitamin-d-level-interpreter.md): Enter your 25-OH vitamin D level to see where it sits versus general reference ranges. Converts ng/mL to nmol/L. A wellness reference, not a diagnostic tool. - [Water Intake Calculator](https://www.health3.app/tools/water-intake-calculator.md): Calculate your daily water intake based on weight, activity level, and climate. Free water intake calculator with personalized hydration recommendations. ## Use cases How to use blood-work tracking for specific goals, conditions, and populations. - [Blood Test Tracking After Bariatric Surgery](https://www.health3.app/use-cases/blood-test-tracking-for-post-bariatric-surgery.md): Learn how blood test tracking helps post-bariatric surgery. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking During Pregnancy](https://www.health3.app/use-cases/blood-test-tracking-for-pregnancy.md): Track ferritin, TSH, vitamin D, folate, and glucose in pregnancy. Health3 helps you understand antenatal blood results alongside your obstetric provider. - [Blood Test Tracking for Accutane (Isotretinoin) Users](https://www.health3.app/use-cases/blood-test-tracking-for-accutane-users.md): Track liver enzymes, triglycerides, and nutrients during isotretinoin. Health3 helps Accutane users organise monthly bloodwork across their 4–6 month course. - [Blood Test Tracking for Aging Parent Caregivers](https://www.health3.app/use-cases/blood-test-tracking-for-aging-parents-caregivers.md): Learn how blood test tracking helps caregivers for aging parents. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Andropause](https://www.health3.app/use-cases/blood-test-tracking-for-andropause.md): Track testosterone decline, DHEA-S, cortisol, and metabolic markers during andropause. Monitor gradual hormonal aging with objective data using Health3. - [Blood Test Tracking for Annual Checkups](https://www.health3.app/use-cases/blood-test-tracking-for-annual-checkups.md): Get more from your annual physical. Compare results year over year, spot trends, and see if your values are truly optimal — not just normal. Free with Health3. - [Blood Test Tracking for Apple Watch and Apple Health Users](https://www.health3.app/use-cases/blood-test-tracking-for-apple-watch-users.md): Apple Watch tracks activity, heart rate, and sleep — pair it with blood biomarkers in Health3 via Apple Health integration for a fuller wellness picture. - [Blood Test Tracking for B12 Deficiency: Detect and Monitor This Common Deficiency](https://www.health3.app/use-cases/blood-test-tracking-for-b12-deficiency.md): Learn how blood test tracking helps b12 deficiency. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Biohackers](https://www.health3.app/use-cases/blood-test-tracking-for-biohackers.md): Biohacking needs data, not guesses. Track cortisol, IGF-1, testosterone, glucose, lipids, and 175 more biomarkers across interventions. Free with Health3. - [Blood Test Tracking for Bodybuilders: Optimize Performance with Data](https://www.health3.app/use-cases/blood-test-tracking-for-bodybuilders.md): Track testosterone, IGF-1, cortisol, ferritin, and recovery markers across bulks and cuts. The complete bodybuilder blood test guide. Free with Health3. - [Blood Test Tracking for Brain Fog and Cognitive Fatigue](https://www.health3.app/use-cases/blood-test-tracking-for-brain-fog.md): Brain fog is a symptom, not a diagnosis. Systematically investigate B12, thyroid, glucose, and homocysteine with blood tests tracked over time in Health3. - [Blood Test Tracking for Breastfeeding Mothers: Nourish Yourself While Nourishing Your Baby](https://www.health3.app/use-cases/blood-test-tracking-for-breastfeeding-mothers.md): Breastfeeding draws on maternal stores. Track iron, vitamin D, B12, and thyroid markers to protect your health while feeding your baby. Free with Health3. - [Blood Test Tracking for Carnivore Dieters: Monitor Your All-Meat Approach](https://www.health3.app/use-cases/blood-test-tracking-for-carnivore-dieters.md): All-meat eating shifts cholesterol, liver enzymes, ferritin, and uric acid in distinct patterns. Monitor what matters on carnivore — free with Health3. - [Blood Test Tracking for Celiac Disease Patients](https://www.health3.app/use-cases/blood-test-tracking-for-celiac-disease.md): Track ferritin, B12, folate, vitamin D, zinc, and calcium if you have celiac disease. Monitor nutrient recovery across your gluten-free diet with Health3. - [Blood Test Tracking for CGM Users (Stelo, Lingo, Dexcom)](https://www.health3.app/use-cases/blood-test-tracking-for-cgm-users.md): CGMs like Stelo and Lingo show real-time glucose trends, but blood tests add fasting insulin, HbA1c context, and the micronutrients that shape metabolic health. - [Blood Test Tracking for Chronic Fatigue: Find the Biomarker Clues](https://www.health3.app/use-cases/blood-test-tracking-for-chronic-fatigue.md): Persistent fatigue? Check ferritin, B12, vitamin D, thyroid, glucose, and cortisol. A systematic blood test guide to find treatable causes of chronic tiredness. - [Blood Test Tracking for Chronic Illness Caregivers](https://www.health3.app/use-cases/blood-test-tracking-for-chronic-illness-caregivers.md): Learn how blood test tracking helps chronic illness caregivers. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Chronic Inflammation: Monitor Your Inflammatory Markers](https://www.health3.app/use-cases/blood-test-tracking-for-chronic-inflammation.md): Learn how blood test tracking helps chronic inflammation. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for College Students: Start Your Health Data Journey](https://www.health3.app/use-cases/blood-test-tracking-for-college-students.md): Learn how blood test tracking helps college students. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Competitive Swimmers: Dive Deeper into Your Health Data](https://www.health3.app/use-cases/blood-test-tracking-for-competitive-swimmers.md): Learn how blood test tracking helps competitive swimmers. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Crohn's Disease & IBD](https://www.health3.app/use-cases/blood-test-tracking-for-crohns-ibd.md): Track ferritin, B12, vitamin D, and nutritional markers in Crohn's disease and ulcerative colitis. Monitor deficiencies and medication effects with Health3. - [Blood Test Tracking for CrossFit Athletes: Train Smarter with Biomarker Data](https://www.health3.app/use-cases/blood-test-tracking-for-crossfit-athletes.md): Learn how blood test tracking helps crossfit athletes. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Cyclists](https://www.health3.app/use-cases/blood-test-tracking-for-cyclists.md): Cyclists face iron depletion, hormonal suppression, and bone density risk. Track ferritin, testosterone, vitamin D, and calcium across your cycling season. - [Blood Test Tracking for Doctor Visit Preparation](https://www.health3.app/use-cases/blood-test-tracking-for-doctor-visits.md): Learn how blood test tracking helps doctor visit preparation. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Elimination Diets: Monitor Nutritional Impact During Food Exclusions](https://www.health3.app/use-cases/blood-test-tracking-for-elimination-diets.md): Learn how blood test tracking helps elimination diets. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Endometriosis](https://www.health3.app/use-cases/blood-test-tracking-for-endometriosis.md): Track ferritin, vitamin D, cortisol, TSH, iron, and B12 with endometriosis. Support pain and symptom management and monitor anaemia risk with Health3. - [Blood Test Tracking for Endurance Athletes: Fuel Your Performance](https://www.health3.app/use-cases/blood-test-tracking-for-endurance-athletes.md): Endurance training depletes iron and suppresses thyroid. Track ferritin, B12, T3, and cortisol to catch problems before performance drops. Free with Health3. - [Blood Test Tracking for Executives](https://www.health3.app/use-cases/blood-test-tracking-for-executives.md): High-pressure leadership roles elevate cortisol, glucose, and cardiovascular risk. Track the biomarkers your annual executive physical misses with Health3. - [Blood Test Tracking for Expats](https://www.health3.app/use-cases/blood-test-tracking-for-expats.md): Learn how blood test tracking helps expats. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Fibromyalgia Patients](https://www.health3.app/use-cases/blood-test-tracking-for-fibromyalgia.md): Track ferritin, B12, vitamin D, TSH, free T3, and magnesium in fibromyalgia. Rule out alternative causes and manage deficiencies that worsen symptoms. - [Blood Test Tracking for Frequent Testers](https://www.health3.app/use-cases/blood-test-tracking-for-frequent-testing.md): Learn how blood test tracking helps frequent testing. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Frequent Travelers](https://www.health3.app/use-cases/blood-test-tracking-for-frequent-travelers.md): Learn how blood test tracking helps frequent travelers. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for GLP-1 Users (Ozempic, Wegovy, Mounjaro)](https://www.health3.app/use-cases/blood-test-tracking-for-glp1-users.md): Track HbA1c, kidney function, B12, and metabolic markers while on semaglutide or tirzepatide. Health3 helps GLP-1 patients monitor biomarkers over months. - [Blood Test Tracking for Gout](https://www.health3.app/use-cases/blood-test-tracking-for-gout.md): Track glucose, insulin, vitamin D, and ferritin for gout. Metabolic syndrome drives uric acid — monitor the metabolic picture that sits behind each attack. - [Blood Test Tracking for Hair Loss (Both Sexes)](https://www.health3.app/use-cases/blood-test-tracking-for-hair-loss.md): Track ferritin, vitamin D, zinc, thyroid markers, and androgens for hair loss. Assess alopecia, telogen effluvium, and nutrient-related shedding with Health3. - [Blood Test Tracking for Health Anxiety](https://www.health3.app/use-cases/blood-test-tracking-for-health-anxiety.md): Learn how blood test tracking helps health anxiety. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Health Transformation](https://www.health3.app/use-cases/blood-test-tracking-for-health-transformation.md): Learn how blood test tracking helps health transformation. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Healthcare Workers](https://www.health3.app/use-cases/blood-test-tracking-for-healthcare-workers.md): Learn how blood test tracking helps healthcare workers. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for High Cholesterol: Monitor Your Cardiovascular Health](https://www.health3.app/use-cases/blood-test-tracking-for-high-cholesterol.md): Learn how blood test tracking helps high cholesterol. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for HRT (Hormone Replacement Therapy) Users](https://www.health3.app/use-cases/blood-test-tracking-for-hrt-users.md): Track FSH, thyroid, vitamin D, and calcium while on HRT. Health3 helps menopausal women monitor biomarker trends throughout hormone replacement therapy. - [Blood Test Tracking for Hypertension (High Blood Pressure)](https://www.health3.app/use-cases/blood-test-tracking-for-hypertension.md): Track potassium, sodium, TSH, cortisol, and glucose for hypertension. Blood tests identify secondary causes and support full cardiovascular risk assessment. - [Blood Test Tracking for HYROX Athletes](https://www.health3.app/use-cases/blood-test-tracking-for-hyrox-athletes.md): HYROX demands iron-level endurance and hormonal strength. Track ferritin, cortisol, testosterone, magnesium, and glucose to stay race-ready all season. - [Blood Test Tracking for Intermittent Fasters: Measure Your Metabolic Benefits](https://www.health3.app/use-cases/blood-test-tracking-for-intermittent-fasters.md): Learn how blood test tracking helps intermittent fasters. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for IVF & Fertility Treatment Patients](https://www.health3.app/use-cases/blood-test-tracking-for-ivf-patients.md): Track FSH, TSH, vitamin D, ferritin, folate, and B12 during IVF and fertility treatment. Complement your clinic monitoring with longitudinal Health3 tracking. - [Blood Test Tracking for Keto Dieters: Monitor Your Metabolic Shift](https://www.health3.app/use-cases/blood-test-tracking-for-keto-dieters.md): What blood tests should you get on keto? Track lipids, electrolytes, ketones, and metabolic markers. Free guide to monitoring biomarkers on a ketogenic diet. - [Blood Test Tracking for Long COVID Symptoms](https://www.health3.app/use-cases/blood-test-tracking-for-long-covid.md): Track ferritin, vitamin D, B12, and cortisol for long COVID. Emerging research suggests several biomarkers may be informative — monitor trends systematically. - [Blood Test Tracking for Longevity Enthusiasts](https://www.health3.app/use-cases/blood-test-tracking-for-longevity-enthusiasts.md): Learn how blood test tracking helps longevity enthusiasts. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Low Libido in Men and Women](https://www.health3.app/use-cases/blood-test-tracking-for-low-libido.md): Which hormone tests explain low libido? Testosterone, thyroid, DHEA-S, prolactin, and cortisol are the measurable causes. Track them over time with Health3. - [Blood Test Tracking for Low Testosterone](https://www.health3.app/use-cases/blood-test-tracking-for-low-testosterone.md): Track total testosterone, free testosterone, FSH, DHEA-S, and cortisol across diagnostic panels. Build your hormonal picture for low-T evaluation with Health3. - [Blood Test Tracking for Marathon Runners: Protect Your Health Across Training Cycles](https://www.health3.app/use-cases/blood-test-tracking-for-marathon-runners.md): Marathon training depletes iron and disrupts thyroid before symptoms appear. Track ferritin, T3, and cortisol across training cycles to protect performance. - [Blood Test Tracking for Men Over 40: Stay on Top of Metabolic and Hormonal Changes](https://www.health3.app/use-cases/blood-test-tracking-for-men-over-40.md): Learn how blood test tracking helps men over 40. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Men Over 50: Monitor What Matters Most](https://www.health3.app/use-cases/blood-test-tracking-for-men-over-50.md): Learn how blood test tracking helps men over 50. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Menopause](https://www.health3.app/use-cases/blood-test-tracking-for-menopause.md): Post-menopausal women face elevated cardiovascular and bone loss risk. Track FSH, glucose, calcium, vitamin D, and more with Health3 to stay proactive. - [Blood Test Tracking for Metabolic Syndrome](https://www.health3.app/use-cases/blood-test-tracking-for-metabolic-syndrome.md): Track glucose, insulin, vitamin D, ferritin, and magnesium for metabolic syndrome. Monitor the blood markers behind the criteria and act before they compound. - [Blood Test Tracking for Metformin Users](https://www.health3.app/use-cases/blood-test-tracking-for-metformin-users.md): Track B12, glucose, insulin, and kidney function on metformin. Health3 helps metformin users monitor trends — including the well-documented B12 depletion. - [Blood Test Tracking for MMA Fighters](https://www.health3.app/use-cases/blood-test-tracking-for-mma-fighters.md): MMA weight cuts disrupt electrolytes, hormones, and glucose. Track potassium, sodium, cortisol, and testosterone to train and recover smarter each camp. - [Blood Test Tracking for New Year Health Goals](https://www.health3.app/use-cases/blood-test-tracking-for-new-year-health-goals.md): Learn how blood test tracking helps new year health goals. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Non-English Speakers](https://www.health3.app/use-cases/blood-test-tracking-for-non-english-speakers.md): Learn how blood test tracking helps non-english speakers. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Obstacle Course Racers](https://www.health3.app/use-cases/blood-test-tracking-for-obstacle-course-racers.md): OCR athletes need iron, cortisol, zinc, and vitamin D tracking. Monitor immune resilience and recovery across a heavy Spartan, Tough Mudder, or OCR season. - [Blood Test Tracking for Ongoing Conditions](https://www.health3.app/use-cases/blood-test-tracking-for-ongoing-conditions.md): Learn how blood test tracking helps ongoing conditions. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Oura Ring Users and HRV Data](https://www.health3.app/use-cases/blood-test-tracking-for-oura-ring-users.md): Oura tracks HRV, sleep, and readiness — but persistent drops often trace to measurable biomarkers. Discover which blood tests explain your Oura ring data. - [Blood Test Tracking for Paper Lab Reports](https://www.health3.app/use-cases/blood-test-tracking-for-paper-lab-reports.md): Got paper lab reports? Snap a photo and Health3 automatically extracts 180+ biomarkers. Build a complete digital record from scattered paper results. Free. - [Blood Test Tracking for Parents](https://www.health3.app/use-cases/blood-test-tracking-for-parents.md): Learn how blood test tracking helps parents. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Patients with Multiple Doctors](https://www.health3.app/use-cases/blood-test-tracking-for-multiple-doctors.md): Tired of juggling lab results across specialists? Build one unified blood test record and share clean PDF reports with any doctor. Free tracking with Health3. - [Blood Test Tracking for Perimenopause](https://www.health3.app/use-cases/blood-test-tracking-for-perimenopause.md): Track FSH, TSH, vitamin D, ferritin, and cortisol through perimenopause. Understand what your blood results mean as your hormones fluctuate with Health3. - [Blood Test Tracking for Persistent Unexplained Fatigue](https://www.health3.app/use-cases/blood-test-tracking-for-unexplained-fatigue.md): Persistent fatigue has many measurable causes. Track ferritin, thyroid, B12, and vitamin D with Health3 to investigate systematically — not self-diagnose. - [Blood Test Tracking for Personal Trainers: Practice What You Preach](https://www.health3.app/use-cases/blood-test-tracking-for-personal-trainers.md): Learn how blood test tracking helps personal trainers. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Pilots and Aviators](https://www.health3.app/use-cases/blood-test-tracking-for-pilots.md): FAA medical exams check lipids, HbA1c, and liver enzymes. Track between examinations and monitor jet lag, sleep disruption, and altitude-related biomarkers. - [Blood Test Tracking for Poor Sleep and Insomnia Symptoms](https://www.health3.app/use-cases/blood-test-tracking-for-poor-sleep.md): Can a blood test detect insomnia? Not directly, but ferritin, thyroid, cortisol, magnesium, and vitamin D reveal treatable contributors. Track them with Health3. - [Blood Test Tracking for Postpartum Recovery](https://www.health3.app/use-cases/blood-test-tracking-for-postpartum-recovery.md): Track ferritin, TSH, vitamin D, B12, and cortisol across the postpartum year. Identify postpartum thyroiditis and iron store depletion early using Health3. - [Blood Test Tracking for Powerlifters](https://www.health3.app/use-cases/blood-test-tracking-for-powerlifters.md): Track testosterone, cortisol, ferritin, and micronutrients across meet prep and off-season. Monitor how maximal-strength training shapes your blood biomarkers. - [Blood Test Tracking for Prostate Health](https://www.health3.app/use-cases/blood-test-tracking-for-prostate-health.md): Track testosterone, vitamin D, selenium, and zinc alongside your PSA results for prostate health monitoring. Organize your screening history with Health3. - [Blood Test Tracking for Psoriasis and Psoriatic Disease](https://www.health3.app/use-cases/blood-test-tracking-for-psoriasis.md): Track vitamin D, glucose, fasting insulin, ferritin, and homocysteine in psoriasis. Monitor metabolic comorbidities and medication effects with Health3. - [Blood Test Tracking for Quitting Smoking](https://www.health3.app/use-cases/blood-test-tracking-for-quitting-smoking.md): Quitting smoking improves cardiovascular and metabolic health measurably. Track vitamin C, homocysteine, ferritin, and more as your body recovers with Health3. - [Blood Test Tracking for Recreational Gym-Goers: Understand What's Happening Inside](https://www.health3.app/use-cases/blood-test-tracking-for-recreational-gym-goers.md): Learn how blood test tracking helps recreational gym-goers. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Remote Workers](https://www.health3.app/use-cases/blood-test-tracking-for-remote-workers.md): Learn how blood test tracking helps remote workers. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Rheumatoid Arthritis (RA)](https://www.health3.app/use-cases/blood-test-tracking-for-rheumatoid-arthritis.md): Track vitamin D, ferritin, folate, B12, and homocysteine in rheumatoid arthritis. Monitor disease-driven deficiencies and medication effects with Health3. - [Blood Test Tracking for Rock Climbers](https://www.health3.app/use-cases/blood-test-tracking-for-rock-climbers.md): Rock climbers face vitamin D gaps, bone density risk, and RED-S. Track calcium, ferritin, magnesium, and testosterone to protect long-term climbing health. - [Blood Test Tracking for Self-Quantifiers](https://www.health3.app/use-cases/blood-test-tracking-for-self-quantifiers.md): Learn how blood test tracking helps self-quantifiers. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Seniors Over 65: Comprehensive Health Monitoring Made Simple](https://www.health3.app/use-cases/blood-test-tracking-for-seniors-over-65.md): Learn how blood test tracking helps seniors over 65. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Shift Workers](https://www.health3.app/use-cases/blood-test-tracking-for-shift-workers.md): Night shifts disrupt cortisol, vitamin D, glucose, and thyroid function. Track the blood markers that suffer most from irregular schedules. Free with Health3. - [Blood Test Tracking for Sleep Optimization](https://www.health3.app/use-cases/blood-test-tracking-for-sleep-optimization.md): Learn how blood test tracking helps sleep optimization. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Statin Users](https://www.health3.app/use-cases/blood-test-tracking-for-statin-users.md): Monitor liver enzymes, glucose, vitamin D, and magnesium on statins. Health3 helps statin users track biomarker changes across years of cardiovascular therapy. - [Blood Test Tracking for Stress Management](https://www.health3.app/use-cases/blood-test-tracking-for-stress-management.md): Learn how blood test tracking helps stress management. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Supplement Users: Verify Your Stack Is Actually Working](https://www.health3.app/use-cases/blood-test-tracking-for-supplement-users.md): Stop guessing if your supplements work. Track vitamin D, B12, iron, magnesium, and zinc levels before and after supplementation. Free tracking with Health3. - [Blood Test Tracking for Tech Workers](https://www.health3.app/use-cases/blood-test-tracking-for-tech-workers.md): Long indoor hours, screen-heavy work, and late-night coding affect vitamin D, insulin, and thyroid. Track the biomarkers tech workers most often miss. - [Blood Test Tracking for the Alcohol-Free Journey](https://www.health3.app/use-cases/blood-test-tracking-for-alcohol-free-journey.md): Going sober or cutting back? Track B12, folate, magnesium, and liver recovery markers as your body resets. Health3 supports your alcohol-free journey with data. - [Blood Test Tracking for the Newly Diagnosed](https://www.health3.app/use-cases/blood-test-tracking-for-newly-diagnosed.md): Learn how blood test tracking helps newly diagnosed. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Triathletes](https://www.health3.app/use-cases/blood-test-tracking-for-triathletes.md): Swim-bike-run training strains iron stores, thyroid function, and hormones. Track ferritin, ft3, cortisol, and selenium to protect triathlon performance. - [Blood Test Tracking for TRT (Testosterone Replacement) Patients](https://www.health3.app/use-cases/blood-test-tracking-for-trt-patients.md): Monitor testosterone, hematocrit, estradiol, and lipid markers during TRT. Health3 helps testosterone replacement patients track biomarkers and spot trends. - [Blood Test Tracking for Understanding Your Results](https://www.health3.app/use-cases/blood-test-tracking-for-understanding-results.md): Learn how blood test tracking helps understanding results. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Unexplained Weight Gain](https://www.health3.app/use-cases/blood-test-tracking-for-unexplained-weight-gain.md): Weight gain despite consistent diet and exercise often has a hormonal or metabolic cause. Track thyroid, insulin, cortisol, and key nutrients with Health3. - [Blood Test Tracking for Uterine Fibroids](https://www.health3.app/use-cases/blood-test-tracking-for-fibroids.md): Track ferritin, iron, TSH, and vitamin D with uterine fibroids. Monitor anaemia from heavy menstrual bleeding and support treatment decisions with Health3. - [Blood Test Tracking for Vegans: Verify Your Diet Supports Complete Nutrition](https://www.health3.app/use-cases/blood-test-tracking-for-vegans.md): What blood tests should vegans get? Monitor B12, iron, vitamin D, omega-3, zinc, and other nutrients commonly low on plant-based diets. Track them with Health3. - [Blood Test Tracking for Vegetarians: Confirm Your Diet Covers the Essentials](https://www.health3.app/use-cases/blood-test-tracking-for-vegetarians.md): What blood tests do vegetarians need? Monitor iron, B12, vitamin D, zinc, and omega-3 — the markers most affected by plant-based eating. Track with Health3. - [Blood Test Tracking for Vitamin D Deficiency: Monitor Your Levels and Recovery](https://www.health3.app/use-cases/blood-test-tracking-for-vitamin-d-deficiency.md): Learn how blood test tracking helps vitamin d deficiency. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Weight Loss](https://www.health3.app/use-cases/blood-test-tracking-for-weight-loss.md): Weight loss is more than the scale. Track insulin, HbA1c, lipids, and liver markers to see real metabolic improvements as you lose weight. Free with Health3. - [Blood Test Tracking for WHOOP Users and Recovery Scores](https://www.health3.app/use-cases/blood-test-tracking-for-whoop-users.md): WHOOP tracks strain, recovery, and sleep — but persistent low recovery scores often reflect blood biomarker deficits. Find out which labs to check and why. - [Blood Test Tracking for Women on Birth Control: Understand How Contraceptives Affect Your Biomarkers](https://www.health3.app/use-cases/blood-test-tracking-for-women-on-birth-control.md): Hormonal contraceptives change B vitamin, folate, and thyroid markers. See which blood tests women on birth control should monitor — track changes with Health3. - [Blood Test Tracking for Women Over 40: Monitor the Changes That Matter](https://www.health3.app/use-cases/blood-test-tracking-for-women-over-40.md): Learn how blood test tracking helps women over 40. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Women Over 50: Stay Ahead of Post-Menopausal Health Changes](https://www.health3.app/use-cases/blood-test-tracking-for-women-over-50.md): Learn how blood test tracking helps women over 50. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. - [Blood Test Tracking for Women Trying to Conceive: Prepare Your Body with Data](https://www.health3.app/use-cases/blood-test-tracking-for-women-trying-to-conceive.md): Trying to conceive? Check thyroid, iron, vitamin D, folate, and B12 — the blood markers that matter most for fertility and preconception health. With Health3. - [Blood Test Tracking for Women with Heavy Periods: Protect Your Iron Stores](https://www.health3.app/use-cases/blood-test-tracking-for-women-with-heavy-periods.md): Heavy periods can silently deplete iron. Track ferritin and iron markers to catch deficiency before fatigue or anemia sets in. Free monitoring with Health3. - [Blood Test Tracking for Young Adults: Build Your Health Baseline Early](https://www.health3.app/use-cases/blood-test-tracking-for-young-adults.md): Learn how blood test tracking helps young adults. Discover key biomarkers to monitor, what your results mean, and how the Health3 app can help you track trends over time. ## Topics Health topics and the biomarkers that matter for each. - [Bone Health: Calcium, Vitamin D, and Related Biomarkers](https://www.health3.app/topics/bone-health.md): Discover the key blood biomarkers for bone health, including calcium, vitamin D (25-OH), magnesium, and vitamin K. Learn what your lab values mean and how to support strong bones at every age. - [Cardiovascular Health: Cholesterol, Inflammation, and Key Markers](https://www.health3.app/topics/cardiovascular-health.md): Learn how cholesterol, inflammation, homocysteine, magnesium, and potassium affect your cardiovascular health. Understand key blood markers and what they reveal about heart disease risk. - [Energy and Fatigue: Biomarkers That May Explain Low Energy](https://www.health3.app/topics/energy-and-fatigue.md): Persistent fatigue often has measurable causes. Learn which blood biomarkers—ferritin, iron, vitamin D, vitamin B12, TSH, and magnesium—may help explain low energy levels and what to do about them. - [Hormonal Balance: Key Hormones and What Blood Tests Reveal](https://www.health3.app/topics/hormonal-balance.md): Learn how blood tests measure key hormones including cortisol, DHEA-S, testosterone, FSH, and estradiol. Understand what balanced hormone levels mean for your health. - [Inflammation and Immune Health: Biomarkers That Matter](https://www.health3.app/topics/inflammation-and-immune-health.md): Discover the key blood biomarkers that reflect inflammation and immune function, including homocysteine, zinc, selenium, and vitamin C. Learn what each marker reveals about your health. - [Iron Status and Anemia: Understanding the Key Biomarkers](https://www.health3.app/topics/iron-and-anemia.md): A research-backed guide to iron status and anemia biomarkers—ferritin, serum iron, TIBC, vitamin B12, and folate—and what your lab results mean for your health. - [Metabolic Health: Blood Sugar, Insulin, and Related Markers](https://www.health3.app/topics/metabolic-health.md): Learn about the key blood biomarkers that reflect metabolic health, including fasting glucose, insulin, HbA1c, and magnesium. Understand what your numbers mean and how to support healthy metabolism. - [Thyroid Health: Key Biomarkers and What Research Shows](https://www.health3.app/topics/thyroid-health.md): Learn about the key thyroid biomarkers—TSH, Free T3, Free T4, and selenium—what research shows about thyroid function, and how to understand your lab results.