Corrected Calcium Calculator
Albumin-Corrected Calcium
Formula
Corrected Ca = Measured Ca + 0.8 × (4.0 − Albumin). Normal range: 8.5–10.5 mg/dL.
Frequently Asked Questions
Why do we correct calcium for albumin?
About 40% of calcium in the blood is bound to albumin. When albumin is low, total calcium appears low even if the physiologically active (ionized) calcium is normal. The correction adjusts for this.
What is the corrected calcium formula?
Corrected Calcium = Measured Calcium + 0.8 × (4.0 − Albumin). This adds 0.8 mg/dL of calcium for every 1 g/dL that albumin is below 4.0.
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