Corrected Calcium

Adjust calcium level for hypoalbuminemia.

Lab Values

Serum Calcium

mg/dL

Total serum calcium. Normal: 8.5-10.5 mg/dL. May be falsely low with hypoalbuminemia.

Serum Albumin

g/dL

Serum albumin level. Normal: 3.5-5.0 g/dL. Low albumin causes falsely low total calcium.

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Corrected Calcium

0.0 mg/dL

Severe Hypocalcemia

Measured Ca

8 mg/dL

Albumin

3 g/dL

Correction Factor

+0.80 mg/dL

Corrected Ca

0.0 mg/dL

Formula

Corrected Ca = Measured Ca + 0.8 × (4 - Albumin)

= 8 + 0.8 × (4 - 3) = 8 + 0.80 = 0.0 mg/dL

For each 1 g/dL decrease in albumin below 4, add 0.8 mg/dL to calcium.

Frequently Asked Questions