Apply the Payne correction: measured calcium + 0.8 × (4 − albumin).
| Corrected Ca (mg/dl) | – |
Use this calculator when total calcium is in mg/dl and albumin is in g/dl. Corrected Ca = measured Ca + 0.8 × (4 − albumin). Ionised calcium beats the formula. This page does not convert SI units (mmol/L calcium, g/L albumin).
Calcium: Total calcium from the lab, mg/dl.
Albumin: Serum albumin, g/dl.
Corrected Ca: Payne-corrected calcium, mg/dl.
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