🦴 Corrected Calcium (Albumin)
Adjust total calcium for low albumin with the corrected calcium formula.
Corrected Calcium (Albumin)
Measured total calcium (mg/dL)
Albumin (g/dL)
When to use
Interpret calcium in hypoalbuminaemia.
How it works
Corrected Ca = measured Ca + 0.8 × (4.0 − albumin g/dL). Reference 8.5–10.5 mg/dL.
Key points
- Low albumin lowers total but not ionised calcium.
- Ionised calcium is more reliable in critical illness.
- Correct before judging hypo-/hypercalcaemia.
References
Decision support for licensed clinicians only; not a substitute for clinical judgement, diagnosis or local protocols.