Electrolytes · Restricted estimate
Corrected Calcium
A deliberately restricted implementation of the common simplified Payne-derived albumin adjustment—not a substitute for ionized calcium.
Required acknowledgement
This estimate can misclassify calcium status.
Contemporary evidence questions routine generic albumin adjustment. Ionized calcium is preferred when accurate calcium status matters, especially in critical illness, kidney dysfunction or dialysis, major acid–base disturbance, and other settings where protein binding is altered.
- This is a generic formula, not a laboratory-specific correction.
- A reassuring result must not override symptoms, context, or a measured ionized calcium.
- Use the cited evidence, stated exclusions, and current institutional approach when deciding whether this estimate applies.
About this tool
Corrected Calcium Calculator
Use this restricted corrected calcium calculator only after reviewing the evidence warning. It reports an albumin-adjusted estimate, not a measured ionized calcium value.
Generic calcium-correction formulas can misclassify calcium status. The page prioritizes ionized calcium when accuracy matters and keeps the limitation visible before calculation.