Albumin-Corrected Calcium
Adjusts total calcium for a low albumin, so hypocalcaemia is not over-called.
When to use it. Interpreting a total calcium when the albumin is abnormal — most inpatients, and almost everyone who is acutely unwell.
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Limits of this score. A correction, not a measurement. It performs poorly in critical illness and in CKD; when the answer changes management, measure ionised calcium instead. Acid–base status shifts ionised calcium independently of albumin, and this formula does not see that at all.
Sources
- Payne RB, et al. Interpretation of serum calcium in patients with abnormal serum proteins. BMJ. 1973.
Where this is written from. This site is written from Indian clinical practice. Drug availability and brand names, vaccination schedules, national health programmes and some reference cut-offs differ between countries — a schedule or a threshold that is standard here may not be standard where you are. If you are reading outside India, check anything on this page against your own country’s guidance before you act on it.
Educational use only — not medical advice. Never a substitute for clinical judgement.