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Test Code SQ CAIONP, EPIC LAB54 Calcium, Ionized, Plasma



Performing Laboratory

Meriter Laboratories

Specimen Requirements

Submit only 1 of the following specimens:



Specimen must arrive within 15 minutes of draw or <2 hours if kept on ice unopened.


Specimen Type: Whole blood

Container/Tube: Dark-green top (lithium heparin-no gel)
Specimen Volume: 4 mL

Collection Instructions: Keep specimen anaerobic (do not open tube).


Alternate-External Clients:

Specimen Type:  Lithium heparin plasma from an unopened PST tube

Container/Tube: Light-green top (lithium heparin gel)

Specimen Volume: 3 mL

Collection Instructions:

1. Centrifuge as soon as possible.

2. Keep specimen anaerobic (do not open tube).

Additional Information: Centrifuged specimen is stable up to 24 hours.

Specimen Transport Temperature


Reference Values

<4 days: 4.01-5.21 mg/dL

≥4 days-<7 days: 4.61-5.61 mg/dL

≥7 days: 4.51-5.29 mg/dL

Critical values (automatic call-back): ≤3.41 mg/dL or ≥5.61 mg/dL


Reporting Title

Ionized Calcium

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding