Corrected Calcium Calculator
Serum Calcium (mg/dL)
Serum Albumin (g/dL)
Low albumin falsely lowers measured serum calcium. Corrected calcium adjusts for this to reveal the true physiologically active level, essential for correct clinical interpretation.
- 1Corrected Ca = Measured Ca + 0.8 × (4 − Albumin g/dL)
- 2Normal albumin = 4 g/dL
- 3Normal corrected calcium = 8.5–10.5 mg/dL
- 4Each 1 g/dL drop in albumin lowers measured Ca ~0.8 mg/dL
Ca 7.6, Albumin 2.2 g/dL=Corrected Ca = 7.6 + 0.8×1.8 = 9.04 mg/dL (actually normal)
| Corrected Ca | Status | Symptoms |
|---|---|---|
| < 8.5 mg/dL | Hypocalcaemia | Tetany, cramps, tingling |
| 8.5–10.5 mg/dL | Normal | None |
| > 10.5 mg/dL | Hypercalcaemia | Fatigue, thirst, stones |
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