Test Name: CALCIUM, IONIZED, SERUM
Test Code: 2196681
Alias: Calcium, Filterable
Calcium, Free
Calcium, Unbound
LAB3043
CPT Code(s): 82330  
Preferred Specimen: 2.0 mL serum
Container:

SST (gold)
Minimum Volume:

0.6 mL serum
Collection Instructions:

Let clot and spin immediately with the cap on.

DO NOT OPEN TUBE

Ship the unopened gel barrier tube at room temperature.

If submitting with any other assay, please submit a separate tube for this test.
Transport Temperature: Room temperature
Stability:

Room temperature: 7 days

Refrigerated: 7 days

Frozen: unacceptable
Rejection Criteria:

Gross hemolysis

Grossly lipemic

Received frozen

Red-top tube (no gel)

Microtainer
Additional Information: **Please write DO NOT OPEN on test label**
Schedule: Set up: Tues-Sun; Report available: 2 days
Method: Ion-Specific Electrode (ISE)
Performing Lab: Quest Diagnostics, Wood Dale; #306
Clinical Significance:

The ionized calcium is determined by an ion selective electrode methodology. The result that is generated is pH adjusted. The result is empirically based on a measured pH and ionized calcium concentration normalized to a pH of 7.40. This calculation compensates for in vitro changes in pH due to loss of CO2 through specimen handling. Ionized calcium represents the true "bioavailable" calcium in the circulation. In situations where the total calcium is normal but does not fit the clinical picture, e.g., hyperparathyroidism, a determination of the ionized calcium will, many times, show an elevation in the "bioavailable" calcium component. This may be due to alterations in protein concentrations, especially albumin, that binds most of the calcium in the circulation.
Use: Updated 2/28/22
Reference Ranges: <8 Months                 Not established
8 Months-10 Years   4.9-5.4 mg/dL
11-17 Years               4.8-5.3 mg/dL
Adult                            4.8-5.6 mg/dL

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The CPT codes included in this publication are in accordance with Current Procedural Terminology, a publication of the American Medical Association. CPT codes are provided here for the convenience of our clients; however, correct coding often varies from one carrier to another, and HealthLab may bill specific carriers using codes other than those shown. Clients who bill for services should verify the code(s) with the applicable payor to confirm that their use is appropriate in each case.
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