Hormonal Balance: Key Hormones and What Blood Tests Reveal

Why Hormonal Balance Matters

Hormones are chemical messengers produced by endocrine glands and released into the bloodstream, where they travel to target tissues and trigger specific responses. When hormone levels fall outside their optimal ranges—whether too high or too low—the effects can be wide-ranging: persistent fatigue, weight gain, mood changes, disrupted sleep, reduced libido, and impaired fertility are among the most commonly reported symptoms. Blood testing provides an objective measurement that complements clinical assessment, helping clinicians distinguish hormonal causes from other underlying conditions.

Key Hormones Measured by Blood Tests

A standard hormonal panel may include several of the following biomarkers, depending on clinical context, age, and sex. Understanding what each test measures helps you interpret your results more meaningfully.

Cortisol (Total Serum)

Cortisol is the body's primary stress hormone, produced by the adrenal glands in response to signals from the hypothalamic-pituitary-adrenal (HPA) axis. It follows a diurnal pattern, peaking in the early morning and declining throughout the day.[1] Chronically elevated cortisol—often driven by unrelenting stress, poor sleep, or underlying conditions such as Cushing's syndrome—is associated with central weight gain, hypertension, impaired immune function, and disrupted glucose regulation.[5] Persistently low cortisol can suggest adrenal insufficiency. Learn more about Cortisol (Total Serum).

DHEA-S

Dehydroepiandrosterone sulfate (DHEA-S) is secreted predominantly by the adrenal cortex and serves as a precursor to both androgens and estrogens. Levels peak in the mid-twenties and decline steadily with age. DHEA-S is clinically relevant as a marker of adrenal androgenic activity, and low levels have been associated with fatigue, reduced libido, and diminished sense of well-being in older adults. Explore the DHEA-S biomarker page.

Testosterone (Total and Free)

Testosterone is the principal androgen in both sexes, though circulating levels differ markedly by sex. Total testosterone measures all testosterone in the blood, while free testosterone represents the biologically active fraction not bound to sex hormone-binding globulin (SHBG) or albumin. In men, low testosterone is associated with reduced energy, muscle loss, erectile dysfunction, and mood changes.[2] In women, excess testosterone can contribute to acne, hirsutism, and polycystic ovary syndrome (PCOS).[4] See detailed pages for Free Testosterone and Total Testosterone.

Follicle-Stimulating Hormone (FSH)

FSH is a gonadotropin secreted by the pituitary gland that regulates reproductive function. In women, FSH stimulates follicular development in the ovaries, and elevated FSH—particularly in the follicular phase—is a reliable indicator of diminished ovarian reserve or menopause.[3] In men, FSH supports spermatogenesis; abnormally high levels may indicate primary testicular failure. Visit the FSH biomarker page for reference ranges and clinical interpretation.

Hormonal Biomarker Reference Table

Interpreting Your Hormonal Panel

Reference ranges for hormones are often broader than those for other analytes, and results must be interpreted in the context of age, sex, menstrual cycle phase (in women), time of day of testing, recent stress, medications, and clinical symptoms. A single out-of-range value does not confirm a hormonal disorder—repeat testing and correlation with symptoms are standard practice before any diagnosis or treatment is initiated.

Track Your Hormonal Biomarkers With Health3

Scan your lab results, monitor hormone trends over time, and understand what your numbers mean with the Health3 app.