All tests · Electrolytes & Minerals
Electrolytes & Minerals
Normal range 4.6–5.3 mg/dL (1.15–1.33 mmol/L SI). Specimen: Serum or whole blood.
Also known as: free calcium, iCal.
| Specimen | Serum or whole blood |
|---|---|
| Conventional range | 4.6–5.3 mg/dL |
| SI range | 1.15–1.33 mmol/L |
| Conversion factor | ×0.25 (conventional → SI) |
| Critical value | < 3.2 or > 6.2 mg/dL |
| Panel | Electrolytes & Minerals |
Convert any Calcium, Ionized result between units on the unit converter.
The standard teaching reference range for Calcium, Ionized is 4.6–5.3 mg/dL in conventional units, or 1.15–1.33 mmol/L in SI units. This value is measured in serum or whole blood.
A commonly taught critical (panic) value is < 3.2 or > 6.2 mg/dL. Critical results are reported to the provider immediately under your facility's policy.
Source: Adult reference values compiled from Pagana & Pagana, Mosby's Diagnostic and Laboratory Test Reference, and Fischbach & Dunning, A Manual of Laboratory and Diagnostic Tests. Reference ranges vary by laboratory, method, age, sex, and population — always use the range printed on the actual result.
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