Corrected Calcium Calculator
corrected calcium calculator. Get instant, accurate results. Enter values for instant results with step-by-step formulas.
Reviewed by Rahul Singh, Health & Wellness Specialist
Formula
Corrected Ca = Measured Ca + 0.8 x (4.0 - Albumin)
About 40% of serum calcium is bound to albumin. When albumin is low, total calcium appears low even if ionized (active) calcium is normal. The correction adds 0.8 mg/dL for each 1 g/dL albumin below 4.0.
Worked Examples
Example 1: Low albumin correction
Problem:Measured Ca 8.5 mg/dL, Albumin 3.0 g/dL
Solution:Corrected = 8.5 + 0.8 x (4.0 - 3.0) = 8.5 + 0.8 = 9.3 mg/dL
Result:Corrected Ca: 9.3 mg/dL (Normal)
Frequently Asked Questions
How are corrected lab values calculated?
Some lab values need correction for patient factors. Corrected calcium = measured calcium + 0.8 * (4.0 - albumin). Corrected sodium for hyperglycemia: add 1.6 mEq/L for every 100 mg/dL glucose above 100. Corrected QTc uses Bazett formula: QTc = QT / sqrt(RR interval). These corrections improve clinical accuracy.
Reviewed by Rahul Singh, Health & Wellness Specialist · Editorial policy