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Note
Corrected calcium = 8 + 0.8 × (4 − 3) = 8.8 mg/dL. Ionised calcium is preferred where accuracy matters.
Reference: Payne RB et al., BMJ 1973 (commonly used 0.8 mg/dL per g/dL albumin). For learning only. Reference intervals vary by laboratory, method and patient group; results are interpreted by qualified professionals with the clinical picture.
Corrected Ca (mg/dL) = measured Ca + 0.8 × (4.0 − albumin g/dL)
Ca 8.0 mg/dL, albumin 3.0 g/dL → 8.8 mg/dL
The correction is approximate and lab-specific; ionised calcium is better in critical illness, acid-base disturbance and kidney disease.
For learning only. Reference intervals vary by laboratory, method and patient group; results are interpreted by qualified professionals with the clinical picture.