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CALCIUM IONIZED(GEM)
MessageCHEMISTRY
Test Code
CA-ION
Alias/See Also
IONIZED CALCIUM
Preferred Specimen
VENOUS BLOOD
Minimum Volume
2 MLS
Instructions
***Sample may be drawn in a blood gas syringe, or Alternatively, a special pH-balanced heprin syringe(Pico 50) which may be obtained from the laboratory.***THIS TEST CAN ONLY BE DRAW IN WRJ. NOT AT CBOC'S.COLLECT IN A PICO SYRINGE
Transport Container
HEPARIN SYRINGE OR pH balanced syringe(Pico 50)
Transport Temperature
ROOM TEMPERATURE ASAP, IF LONGER THAN 30 MINS. PLACE ON ICE.
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
unlabeled sample, clotted, delay in transport, needle attached, or air bubbles present.
Setup Schedule
DAILY
Report Available
1 HR
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.
Performing Laboratory
WHITE RIVER JUNCTION VT VA- CHEMISTRY 802-295-9363 EXT: 5518, 5519
