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Calcium, Ionized, Blood*

Important Note

*This test is orderable in Cerner

Note: This test should be used for inpatient testing or specimens that can be collected at 160 Allen Street and brought to the lab immediately on ice.

FOR OUTPATIENT TESTING, Refer to and order CAI- Calcium, Ionized, Serum which will be performed at Mayo Medical Laboratories.

Performing Laboratory

Rutland Regional Medical Center Laboratory

Specimen Requirements

Specimen Type: Whole blood

Container/Tube: Dark-green top (lithium heparin)

Specimen Volume: Full tube

Specimen Minimum Volume: 1 mL

Collection Instructions:

1. Immediately place specimen on wet ice.

2. Send specimen in original tube.

3. Tube must remain unopened until test is performed.

Days Performed


Available STAT

Analytical Time:

1 hour


Ion-Selective Electrode (ISE)


Test Classification and CPT Coding


Specimen Transport Temperature

On wet ice

Normal Reference Values

1.13-1.32 mmol/L

Critical Values

<0.9 mmol/L or >1.4 mmol/L (automatic call-back)