Calcium, Total/Ionized

How to Cite This Chapter: Don-Wauchope A, Chetty VT, Ivica J, Kavsak P, Khan WI, Lafreniere M, Nouri K, Solnica B. Calcium. McMaster Textbook of Internal Medicine. Kraków: Medycyna Praktyczna. Accessed May 26, 2024.
Last Updated: May 9, 2022
Last Reviewed: May 9, 2022
Chapter Information

For a brief introduction and guide to abbreviations, see Laboratory Tests: General Remarks.

Analyte [material]

Calcium, total [S/P/U24h]

Calcium, ionized [P/VB/CB]

Reference range, target level, or decision threshold

Calcium, total: 2.25-2.75 mmol/L (9-11 mg/dL)

<5 mmol/24 h (200 mg/24 h)

Calcium, ionized: 1.0-1.3 mmol/L (4-5.2 mg/dL)

[mmol/L] × 4 = [mg/dL]

Interpretation of results

↑ Causes of hypercalcemia: see Hypercalcemia

↓ Causes of hypocalcemia: see Hypocalcemia

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