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Serum Calcium: normal range & what your result means
Calcium is vital for bones, nerves and muscles. Blood calcium is tightly controlled, so abnormal levels always deserve a cause.
Typical adult reference range
| Measure | Range |
|---|---|
| Total calcium | 8.5–10.2 mg/dL |
| Ionised calcium | 4.6–5.3 mg/dL |
What a HIGH result can mean
- High calcium can cause thirst, constipation, kidney stones and confusion; often from parathyroid problems
What a LOW result can mean
- Low calcium can cause tingling, muscle cramps and spasms
Ranges vary by lab. Reference ranges are TYPICAL ADULT values and vary by laboratory, age, sex, pregnancy and the method used. Always read your result against the range printed on YOUR report, and let your doctor interpret it alongside your history.
Frequently asked questions
What causes high blood calcium?
The most common causes are an overactive parathyroid gland and certain cancers. It is investigated because it affects the kidneys, bones and brain.
Is calcium in the blood the same as bone density?
No — blood calcium reflects the level circulating now, not the calcium stored in bones. Bone density is measured separately (a DEXA scan).
Explore more
Sources & further reading
- World Health Organization (WHO)
- MedlinePlus — U.S. National Library of Medicine
- Ministry of Health & Family Welfare, India
- Indian Council of Medical Research (ICMR)
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.