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Ionized Calcium (Ca²⁺)
Blood
Ionized Calcium (Ca²⁺)
COMMON RANGE
4.57 – 5.43
mg/dL
4.41
5.52
M
Mayo Clinic Laboratories
Adult
↗
See all sources ↓
CONVERT & COMPARE
mg/dL
=
1.25
mmol/L
Reference ranges across 10+ sources
Adult reference ranges from 4 entries across 4 trusted sources, shown in mg/dL. Compare side-by-side.
SOURCE
SEX
AGE
RANGE
VISUAL
CITE
A
ARUP Laboratories
All
≥18
4.5 – 5.3 mg/dL
↗
M
Mayo Clinic Laboratories
All
≥18
4.57 – 5.43 mg/dL
↗
Q
Quest Diagnostics
All
≥18
4.5 – 5.3 mg/dL
↗
L
Labcorp
All
≥18
4.6 – 5.4 mg/dL
↗
A
ARUP Laboratories
All · ≥18
↗
4.5 – 5.3 mg/dL
M
Mayo Clinic Laboratories
All · ≥18
↗
4.57 – 5.43 mg/dL
Q
Quest Diagnostics
All · ≥18
↗
4.5 – 5.3 mg/dL
L
Labcorp
All · ≥18
↗
4.6 – 5.4 mg/dL
Related biomarkers
Often tested alongside ionized calcium (ca²⁺) or part of the same panel.
White Blood Cells (WBC)
Blood
Red Blood Cells (RBC)
Blood
Hemoglobin (Hgb)
Blood
Hematocrit (Hct)
Blood
Platelets (PLT)
Blood
Mean Corpuscular Volume (MCV)
Blood
Sources
A
ARUP Laboratories
M
Mayo Clinic Laboratories
Q
Quest Diagnostics
L
Labcorp
Last updated 2026-05-02
This page aggregates publicly available reference data and clinical information from Mayo Clinic Laboratories and other sources. For general wellness information only — not medical advice. For diagnosis or treatment of any condition, talk to a qualified clinician.
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