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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
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 Ca | Severity | Action |
|---|---|---|
| ≤10.4 mg/dL | Normal | None; monitor |
| 10.5–11.9 mg/dL | Mild hypercalcemia | Outpatient workup; hydration |
| 12.0–13.9 mg/dL | Moderate hypercalcemia | Hospitalize; IV fluids; bisphosphonate |
| ≥14.0 mg/dL | Severe / Crisis | ICU; 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
