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Endocrinology & Metabolism
Corrected Calcium for Albumin
Endocrinology
Corrected Calcium for Albumin — Hypercalcemia Evaluation
Albumin-corrected total calcium with hypercalcemia severity assessment
Please enter calcium between 4 and 20 mg/dL.
Please enter albumin between 1 and 6 g/dL.
✓ Corrected Calcium Results
Severity Reference Table
Corrected CaSeverityAction
≤10.4 mg/dLNormalNone; monitor
10.5–11.9 mg/dLMild hypercalcemiaOutpatient workup; hydration
12.0–13.9 mg/dLModerate hypercalcemiaHospitalize; IV fluids; bisphosphonate
≥14.0 mg/dLSevere / CrisisICU; aggressive IV fluids; calcitonin; dialysis
Formulas
Corrected Ca (mg/dL) = Measured Ca + 0.8 × (4.0 − Albumin)
Corrected Ca (mmol/L) = Corrected Ca (mg/dL) ÷ 4.0
Ionized Ca estimate (mmol/L) ≈ 0.45 × Corrected Ca (mg/dL) ÷ 4.0
Normal ionized Ca: 1.12–1.32 mmol/L

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