Corrected Calcium Calculator
Calculate corrected calcium levels based on albumin. Critical for patients with hypoalbuminemia.
Total calcium levels can be misleading in patients with low albumin. Since roughly 40-50% of calcium is bound to albumin, low albumin levels can make calcium appear falsely low.
Calculator Inputs
Results
Enter values above to see your results
How It Works
This calculator uses the Payne formula to estimate what the calcium level would be if the albumin were normal (4.0 g/dL).
Worked Examples
Patient with Calcium 8.0 and Albumin 2.5
4.0 - 2.5= 1.51.5 × 0.8= 1.28.0 + 1.2= 9.2 mg/dLTips & Best Practices
- •Use this when albumin is < 4.0 g/dL.
- •If ionized calcium is available, that is the gold standard and correction is not needed.
- •Normal corrected calcium range is typically 8.5 - 10.2 mg/dL.
Frequently Asked Questions
What is the formula?
Corrected Ca = Measured Ca + 0.8 * (4.0 - Albumin)
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