ToolsCalculators
Albumin-corrected calcium
Corrects total serum calcium for hypo- or hyperalbuminaemia.
Albumin-corrected calcium
Measured total calcium
Serum albumin
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When to use
- Interpreting total serum calcium when albumin is abnormal — the classic setting is hypoalbuminaemia masking true normocalcaemia.
Formula
Corrected calcium (mg/dL) = measured calcium + 0.8 × (4.0 − albumin [g/dL]).
Pearls and pitfalls
- Ionised calcium is the more reliable measure, particularly in critical illness, acid–base disturbance and renal failure, where correction formulas perform poorly.