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CALCIUM IONIC, BLOOD

Synonym(s):
Lab Section Category
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Specimen Required

​3 mL blood in heparinised calcium titrated syringe. 

Send without delay for immediate analysis as ionised calcium level is pH dependent. Blood pH changes with time of storage.

Method

​Direct Ion-Selective Electrochemistry

Reference Interval / Value

​0 – 6 mth : 0.95 - 1.50 mmol/L

≥ 7 mths: 1.18 - 1.37 mmol/L

Turnaround Time

​Mean = 4 hrs, Range: 3 – 5 hrs

Day(s) Test Set up

​Daily, 24 hrs STAT

Last Updated - 13 Jun 2025