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HelpTest Code ICA Calcium, ionized
Additional Codes
| Epic Ordering Code | LAB54 |
| NBS code | LBC03973 |
| Service code | 31022 |
Specimen Requirements
Submit only one of the following:
| Preferred: | Acceptable: | Acceptable: |
| Dark Green Top (Li Heparin) |
Heparinised Syringe | Capillary |
Additional information: For patients on Irenat (sodium perchlorate) treatment, collect specimen before administration or after 96 hrs of last dose.
Processing Requirements
Place specimen in ice and send to laboratory immediately.
Specimen type: Whole Blood
Volume: Full tube
Specimen Stability
| Specimen Type | Whole Blood |
|---|---|
| Ambient | Reject |
| Refrigerate | 4 hours (blood tube to remain sealed) |
| Frozen | Reject |
Specimen Condition
| Haemolysis | Not applicable |
|---|---|
| Icterus | Not applicable |
| Lipaemia | Not applicable |
| Others: Aliquoted sample, sample not sent in ice | Reject |
Methodology
Potentiometry
Days and Times Performed
24 hrs, TAT 1 day
Reference Interval
1.15 – 1.30 mmol/L
Note: iCA may be falsely low in patients on Irenat (sodium perchlorate) treatment.
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
The physiologically active form of calcium and a better indicator than total calcium for evaluating calcium metabolism.
Update
Last updated 16/07/2026
LOINC Code Information
47596-2
Alias
CA Ionized