How does the Corrected Calcium work?

Corrected Ca = Measured Ca + 0.8 × (4 − Albumin g/dL) Then: Normal albumin = 4 g/dL Then: Normal corrected calcium = 8.5–10.5 mg/dL Then: Each 1 g/dL drop in albumin lowers measured Ca ~0.8 mg/dL.

Can you give an example of how to use the Corrected Calcium?

Example: Input Ca 7.6, Albumin 2.2 g/dL gives a result of Corrected Ca = 7.6 + 0.8×1.8 = 9.04 mg/dL (actually normal).

Is the Corrected Calcium free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Corrected Calcium?

Our Corrected Calcium uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Corrected Calcium

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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.

Symbol	Name	Unit	Description
MeasuredCa	Serum calcium measured	mg/dL (8.5–10.2 normal)	—
Albumin	Serum albumin	g/dL (3.5–5.5 normal)	—
CorrectedCa	Corrected serum calcium	mg/dL	—

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

References

›Corrected calcium — StatPearls

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