Creatinine
Clearance
Estimate CrCl with the Cockcroft-Gault equation for renal dosing.
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Clinical — Electrolytes
Corrected Calcium Calculator
Adjust total serum calcium for a low albumin to estimate the true calcium — enter the measured calcium and albumin to get the corrected value.
Corrected calcium
—
Adjusted to an albumin of 4.0 g/dL.
| Correction applied 0.8 per g/dL deficit | — |
|---|---|
| Interpretation normal 8.5–10.2 | — |
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Enter your figures above to see the step-by-step working.
For clinical reference and education — an ionized calcium is more accurate when it mattersEverything computed client-side — nothing leaves this page
How the Corrected Calcium Calculator Works
About 40 percent of the calcium in blood is bound to albumin, so when albumin is low the measured total calcium reads low even though the physiologically active ionized calcium may be normal. The albumin correction estimates what the total calcium would be if albumin were a normal 4.0 g/dL.
The correction is an approximation and performs poorly at very abnormal albumin levels. When precision matters, a directly measured ionized calcium is more reliable than any formula.
corrected calcium = measured calcium + 0.8 × (4.0 − albumin)
Frequently Asked Questions
Why correct calcium for albumin?
About 40 percent of blood calcium is bound to albumin, so a low albumin lowers the total calcium without changing the active ionized calcium. The correction estimates the total at a normal albumin.
What is the formula?
Corrected calcium equals measured calcium plus 0.8 times (4.0 minus albumin in g/dL).
Is corrected calcium always reliable?
It is an estimate and performs poorly at very abnormal albumin levels. A directly measured ionized calcium is more accurate when precision matters.
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