Calcium, Ionized (serum)
Test Summary
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.
Aliases
- CA++
- Calcium Free
- Free CA
- Free Calcium
- Ionized Calcium
Specimen Collection
Special Instructions
N/A
Preferred Specimen
2 mL serum collected in a serum separator tube (SST)
Minimum Volume
0.6 mL
Instructions
Collect blood (2 mL serum) in a gel barrier tube. Let clot and spin immediately with cap on. Do not open tube. Ship the unopened gel barrier tube at room temperature. Do not freeze.
If submitting with any other assay. Please submit a separate tube for this test.
If submitting with any other assay. Please submit a separate tube for this test.
Patient Preparation
N/A
Storage
N/A
Transport Temperature
Room temperature
Specimen Stability
- Room temperature: 7 days
- Refrigerated: 7 days
- Frozen: Unacceptable
Limitations
N/A
Other Acceptable Specimens
N/A
Unacceptable Specimens
Received frozen; gross hemolysis; grossly lipemic; Red-top tube (no gel)
Order Code
IOCAL
EPIC (Premier) Code
LAB270
Includes
N/A
CPT Code
- 82330
Billing Code
- 670108
CPT Statement
Methodology
Ion Selective Electrode (ISE)
FDA Status
FDA Approved
Physician Attestation of Informed Consent
N/A
Testing Laboratory
Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly VA, 20153
14225 Newbrook Drive
Chantilly VA, 20153
Department
Reference Testing
Reference Range
| <8 Months | 5.3-6.3 mg/dL |
| 8-11 Months | 5.2-6.1 mg/dL |
| 1 Year | 5.1-6.0 mg/dL |
| 2 Years | 4.9-5.8 mg/dL |
| 3 Years | 4.9-5.7 mg/dL |
| 4-6 Years | 4.8-5.7 mg/dL |
| 7-12 Years | 4.8-5.6 mg/dL |
| 13-17 Years | 4.8-5.5 mg/dL |
| 18-89 Years | 4.7-5.5 mg/dL |
| ≥90 Years | 4.5-5.5 mg/dL |
Setup Schedule / Expected Turnaround Time
Daily; Report available: 1 - 2 days
Specimen Collection
Special Instructions
N/A
Preferred Specimen
2 mL serum collected in a serum separator tube (SST)
Minimum Volume
0.6 mL
Instructions
Collect blood (2 mL serum) in a gel barrier tube. Let clot and spin immediately with cap on. Do not open tube. Ship the unopened gel barrier tube at room temperature. Do not freeze.
If submitting with any other assay. Please submit a separate tube for this test.
If submitting with any other assay. Please submit a separate tube for this test.
Patient Preparation
N/A
Storage
N/A
Transport Temperature
Room temperature
Specimen Stability
- Room temperature: 7 days
- Refrigerated: 7 days
- Frozen: Unacceptable
Limitations
N/A
Other Acceptable Specimens
N/A
Unacceptable Specimens
Received frozen; gross hemolysis; grossly lipemic; Red-top tube (no gel)
Result Information
Methodology
Ion Selective Electrode (ISE)
Testing Laboratory
N/A
Reference Range
| <8 Months | 5.3-6.3 mg/dL |
| 8-11 Months | 5.2-6.1 mg/dL |
| 1 Year | 5.1-6.0 mg/dL |
| 2 Years | 4.9-5.8 mg/dL |
| 3 Years | 4.9-5.7 mg/dL |
| 4-6 Years | 4.8-5.7 mg/dL |
| 7-12 Years | 4.8-5.6 mg/dL |
| 13-17 Years | 4.8-5.5 mg/dL |
| 18-89 Years | 4.7-5.5 mg/dL |
| ≥90 Years | 4.5-5.5 mg/dL |
Setup Schedule / Expected Turnaround Time
Daily; Report available: 1 - 2 days