Calcium, ionized, serum or whole blood
4.4–5.4 mg/dL (at pH 7.4) [1.1–1.3 mmol/L]
Whole blood specimen must be collected anaerobically and anticoagulated with standardized amounts of heparin. Tourniquet application must be brief. Specimen should be analyzed promptly.
SST, green (for whole blood)
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