🦴 Corrected Calcium (Albumin)
Adjust total calcium for low albumin with the corrected calcium formula.
Clinical takeaway
Low albumin lowers total but not ionised calcium.
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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.
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Measured total calcium | 8.0 mg/dL |
|---|---|
| Albumin | 2.0 g/dL |
→Corrected calcium9.6mg/dL
- Reference：8.5–10.5 mg/dL
- Formula：Ca + 0.8 × (4.0 − albumin)
Frequently asked questions
- What is Corrected Calcium (Albumin)?
- Adjust total calcium for low albumin with the corrected calcium formula.
- How is Corrected Calcium (Albumin) calculated? What is the core formula?
- Corrected Ca = measured Ca + 0.8 × (4.0 − albumin g/dL). Reference 8.5–10.5 mg/dL.
- When is Corrected Calcium (Albumin) used?
- Interpret calcium in hypoalbuminaemia.
- What are the key clinical points for Corrected Calcium (Albumin)?
- Low albumin lowers total but not ionised calcium. Ionised calcium is more reliable in critical illness. Correct before judging hypo-/hypercalcaemia.
- What are the limits and cautions when using Corrected Calcium (Albumin)?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- How is Corrected Calcium (Albumin) calculated in practice? Can you show a worked example?
- Inputs: Measured total calcium 8.0 mg/dL, Albumin 2.0 g/dL → Result: Corrected calcium 9.6 mg/dL（Reference: 8.5–10.5 mg/dL, Formula: Ca + 0.8 × (4.0 − albumin)）