# Calcium

> 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

*Source: [https://www.health3.app/biomarkers/calcium](https://www.health3.app/biomarkers/calcium)*

### On This Page

- What it measures
- Measurement units
- Reference ranges
- Health impact
- Related biomarkers
- Scientific references

## What is Calcium?

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 the formation and maintenance of strong bones and teeth. Calcium is also essential for blood clotting, muscle contraction, and the transmission of nerve signals. In the heart and other muscles, calcium aids in proper functioning, ensuring that muscles contract and relax correctly. Additionally, calcium is involved in releasing hormones and enzymes that affect almost every function in the human body. **Dietary calcium interferes with absorption of iron.**

**Hypocalcemia**, or low calcium levels, can lead to a variety of health issues. Symptoms can include muscle cramps or spasms, numbness and tingling in the fingers, fatigue, and, in severe cases, can cause confusion or memory loss. Chronic hypocalcemia can lead to weakened bones, increasing the risk of osteoporosis and fractures. In extreme cases, low calcium levels can result in heart failure or seizures, indicating the critical nature of this mineral in cardiovascular and neurological health. **High levels of Magnesium or Phosphate can hinder Calcium absorption. Adequate Vitamin D is crucial for absorption.**

**Hypercalcemia**, or high calcium levels, although less common, can also have serious health consequences. It can result from overactive parathyroid glands, certain cancers, or excessive intake of calcium and vitamin D. Symptoms may include nausea, vomiting, increased thirst and frequent urination, and in severe cases, can lead to kidney stones, bone pain, and irregular heart rhythms. **Excessive calcium can hinder magnesium absorption, potentially leading to magnesium deficiency symptoms like muscle cramps and irregular heartbeat.**

Factors that support **healthy blood calcium levels**:

- Adequate calcium intake can come from a balanced diet that includes dairy products, leafy green vegetables, and calcium-fortified foods. The recommended daily intake varies by age and sex.
- Sufficient vitamin D levels are important, as vitamin D is essential for calcium absorption. Vitamin D can be obtained through sunlight exposure, diet (fatty fish, egg yolks), and supplements if needed.
- Regular weight-bearing exercise helps maintain strong bones and stimulates calcium absorption.
- The intake of other nutrients that can affect calcium absorption, such as **iron**, **magnesium**, and **phosphate**, is worth keeping in view. A healthcare professional can advise on concerns about potential interactions.
- People with underlying health conditions that affect calcium metabolism, such as parathyroid disorders or kidney disease, are usually advised to work closely with a healthcare provider to manage calcium levels appropriately.

## Measurement Units

Calcium can be measured in: mEq/L, mg/100mL, mg/dL, mg/L, mg%, mmol/L, µg/mL, µmol/L

## Reference Ranges by Age and Gender

Reference ranges represent typical values for healthy individuals. A healthcare provider must interpret specific results.

| Age Range | Gender | Unit | Optimal | Normal | Source |
| --- | --- | --- | --- | --- | --- |
| All ages | All genders | mmol/L | - | 2.2 - 2.7 | Goldstein, 1990 |

## Related Biomarkers

- **Albumin** (Coming Soon)

 Albumin is a protein in your blood that binds to calcium, which affects the total calcium measurement in blood tests. When albumin levels are low, the total calcium measured in the blood might appear low, even though the active, free calcium levels are normal.[Payne, 1973][Kenny, 2021]
- [**Vitamin K**](https://www.health3.app/biomarkers/vitamink)

 Vitamin K plays a crucial role in calcium metabolism. It activates proteins that bind calcium, ensuring proper bone mineralization and preventing arterial calcification. This interaction is vital for maintaining bone health and cardiovascular function.[Khalil, 2021][Maresz, 2015]
- [**Magnesium**](https://www.health3.app/biomarkers/magnesium)

 Calcium and Magnesium compete for absorption and an imbalance in one of them may affect the availability of the other[Dai, 2013][Bertinato, 2014].

## Related tools

- [**Blood Test Unit Converter**](https://www.health3.app/tools/blood-test-unit-converter)

## Academic References

1. Judd SE, Khazai N, and Tangpricha V. Calcium and vitamin D: skeletal and extraskeletal health (2008). *Curr Rheumatol Rep*. [DOI: 10.1007/s11926-008-0020-y](https://doi.org/10.1007/s11926-008-0020-y)
2. Betts G. J., DeSaix P., Johnson J. E., Johnson W., Korol O., Kruse DH., Poe B., Wise J. A., Womble M., and Young K. A.. Calcium homeostasis interactions of the skeletal system and other organ systems (2013). *Anatomy and Physiology 2e*. [View Source](https://openstax.org/books/anatomy-and-physiology-2e/pages/6-7-calcium-homeostasis-interactions-of-the-skeletal-system-and-other-organ-systems)
3. Little A. J., Milner J. R., Payne R. B., and Williams R. B.. Interpretation of serum calcium in patients with abnormal serum proteins (1973). *British Medical Journal*. [View Source](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1587636/)
4. Akbari AR, Alam B, Khalil Z, and Sharma H. The Medical Benefits of Vitamin K2 on Calcium-Related Disorders (2021). *Nutrients*. [DOI: 10.3390/nu13020691](https://doi.org/10.3390/nu13020691)
5. de Craen AJ, Breteler MM, Euser SM, Hofman A, Kamper AM, Schram MT, Trompet S, and Westendorp RG. Serum calcium and cognitive function in old age (2007). *J Am Geriatr Soc*. [DOI: 10.1111/j.1532-5415.2007.01418.x](https://doi.org/10.1111/j.1532-5415.2007.01418.x)
6. Goldstein DA.. Clinical Methods: The History, Physical, and Laboratory Examinations (1990). *Clinical Methods: The History Physical and Laboratory Examinations*. [View Source](https://www.ncbi.nlm.nih.gov/books/NBK250/#)
7. Dai Q, Deng X, and Shu X. Modifying effect of calcium/magnesium intake ratio and mortality: a population-based cohort study (2013). *BMJ Open*. [DOI: 10.1136/bmjopen-2012-002111](https://doi.org/10.1136/bmjopen-2012-002111)
8. Han K, Hong KW, Kim BT, Kim K, Kim YS, Park JY, and Park YC. Longitudinal Observation of Muscle Mass over 10 Years According to Serum Calcium Levels and Calcium Intake among Korean Adults Aged 50 and Older: The Korean Genome and Epidemiology Study (2020). *Nutrients*. [DOI: 10.3390/nu12092856](https://doi.org/10.3390/nu12092856)
9. Peacock M. Calcium metabolism in health and disease (2010). *Clin J Am Soc Nephrol*. [DOI: 10.2215/CJN.05910809](https://doi.org/10.2215/CJN.05910809)
10. Burckhardt P., Frassetto L., Gannon R., Lambert H., Lanham-New S., Moore J. B., and Torgerson D.. The effect of supplementation with alkaline potassium salts on bone metabolism: a meta-analysis (2015). *Osteoporosis International*. [DOI: 10.1007/s00198-014-3006-9](https://doi.org/10.1007/s00198-014-3006-9)
11. Abou El Niaj H., Bertinato J., Lavergne C., and Plouffe L. J.. Small increases in dietary calcium above normal requirements exacerbate magnesium deficiency in rats fed a low magnesium diet (2014). *Magnesium Research*. [DOI: 10.1684/mrh.2014.0360](https://doi.org/10.1684/mrh.2014.0360)
12. Ashley DM, Boyce DS, Jahanmir J, Kenny CM, and Murphy CE. Things We Do for No Reason™: Calculating a "Corrected Calcium" Level (2021). *J Hosp Med*. [DOI: 10.12788/jhm.3619](https://doi.org/10.12788/jhm.3619)
13. Basheer M.P., Edakkot Sreekumaran, Kumar K.M., and Ramakrishna T.. A study of serum magnesium calcium and phosphorus level and cognition in the elderly population of South India (2015). *Alexandria Journal of Medicine*. [DOI: 10.1016/j.ajme.2015.11.001](https://doi.org/10.1016/j.ajme.2015.11.001)
14. Borodinsky LN, Hamilton AM, Levin JB, and Tu MK. Calcium signaling in skeletal muscle development maintenance and regeneration (2016). *Cell Calcium*. [DOI: 10.1016/j.ceca.2016.02.005](https://doi.org/10.1016/j.ceca.2016.02.005)
15. Maresz K. Proper Calcium Use: Vitamin K2 as a Promoter of Bone and Cardiovascular Health (2015). *Integr Med (Encinitas)*. [View Source](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4566462/)

### ⚠️ Important Medical Information

This reference page is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Reference ranges vary between laboratories. Always review your lab results with a qualified healthcare provider.