Corrected Calcium Calculator
Adjust total serum calcium for albumin levels
Enter Blood Report Values
mg/dL
g/dL
Normal range: 3.5 â 5.0 g/dL
Results
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Enter calcium and albumin from your blood report.
Formula
Corrected Ca = measured Ca + 0.8 Ã (4.0 â serum albumin)
- Measured Ca (mg/dL) â Total serum calcium from blood test
- Serum albumin (g/dL) â Normal â 4 g/dL
Example: Ca 8.0, Albumin 2.5 â Corrected Ca = 8.0 + 0.8 Ã 1.5 = 9.2 mg/dL
Interpreting Your Result
< 8.5 mg/dL
Hypocalcaemia
Low calcium â symptoms include muscle cramps, tingling
8.5â10.5 mg/dL
Normal
Normal corrected calcium range
> 10.5 mg/dL
Hypercalcaemia
High calcium â investigate cause
Frequently Asked Questions
Why correct calcium for albumin?
~40% of blood calcium is bound to albumin. Low albumin makes total calcium appear falsely low â the correction reveals the true physiological level.
When is ionised calcium better?
In cases of protein abnormalities, ionised (free) calcium measured directly by the lab is more reliable than the correction formula.