Calcium, Ionized (whole blood)
Test Summary
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 CO 2 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.
Aliases
- N/A
Specimen Collection
Special Instructions
Preferred Specimen
Minimum Volume
Instructions
Patient Preparation
Storage
Transport Temperature
Specimen Stability
- 2 hours on ice slurry
- Room Temperature = 30 minutes
- Refrigerated (ice slurry) = 2 hours
- Frozen = n/a
Limitations
Other Acceptable Specimens
Unacceptable Specimens
Order Code
EPIC (Premier) Code
Includes
CPT Code
- 82330
Billing Code
- 300177
CPT Statement
Methodology
FDA Status
Physician Attestation of Informed Consent
Testing Laboratory
2308 Sandridge Drive
Moraine OH, 45439
Department
Reference Range
Setup Schedule / Expected Turnaround Time
Specimen Collection
Special Instructions
Preferred Specimen
Minimum Volume
Instructions
Patient Preparation
Storage
Transport Temperature
Specimen Stability
- 2 hours on ice slurry
- Room Temperature = 30 minutes
- Refrigerated (ice slurry) = 2 hours
- Frozen = n/a