Calcium, Ionized
Test Code: 004804
Performing Lab: LabCorp
CPT Code: 82330 001
Synonym
Ca(++), Ionized, Serum; Calcium Filterable, Serum; Calcium Free, Serum; Calcium Unbound, Serum; Ionized Calcium, Serum
Specimen Type
Serum
Specimen Container
Gel-barrier tube
Volume
1 mL
Specimen Handling
Centrifuge and send unopened gel-barrier tube with vacuum intact. It is critical that the vacuum not be disrupted. Exposure of the serum to room air causes a loss of carbon dioxide to the atmosphere. This changes the sample pH and can prevent the lab from measuring the ionized calcium. To ensure that testing can be performed, send a separate tube for ionized calcium and adhere a piece of labeling tape over the top of the tube with the following written on it "IONIZED CALCIUM-DO NOT OPEN."
Unacceptable Conditions
Hemolysis; opened gel-barrier tube; gel barrier not completely sealing the clot; plasma specimen; gross lipemia
Temperature
Room Temperature. Do NOT freeze
Methodology
Ion-selective electrode (ISE)
Stability
Room Temperature: 14 days
Refrigerated: 14 days
Refrigerated: 14 days
| Result Code | Result Name | LOINC |
|---|---|---|
| 004804 | Calcium, Ionized, Serum | 17864-0 |
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