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Ionized Calcium, Whole Blood
MessagePerforming Lab: Hudson, Regions
Test Code
3543
Alias/See Also
Sunquest: CAWB
CPT Codes
82330
Includes
Ionized Calcium, pH
Preferred Specimen
1.0 mL Heparinized Whole Blood (Blood Gas Syringe)
Minimum Volume
0.5 mL
Other Acceptable Specimens
Lithium Heparin (light green-top) on ICE, Heparinized Capillary,
For Lakeview NA Heparin (dark green)
For Lakeview NA Heparin (dark green)
Instructions
Samples should be free of air bubbles, received on ice slush and run immediately. (Exceptions to the ice slush are samples received via the pneumatic tube system, as long as they are received within 30 minutes of collection.)
HSC-435 Gillette send to Regions WITHIN 1 HOUR, UNSPUN Green Top Tube.
HP Clinics & Sartell - order CAI to Quest
HSC-435 Gillette send to Regions WITHIN 1 HOUR, UNSPUN Green Top Tube.
HP Clinics & Sartell - order CAI to Quest
Transport Container
Blood Gas Syringe
Transport Temperature
Ice Slush
Specimen Stability
Ice Slush: 1 hour
Room Temperature: 30 minutes
Room Temperature: 30 minutes
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Room Temperature >30 minutes
Methodology
Electrode
Setup Schedule
Daily
Report Available
Same Day
Reference Range
>6 months: 1.0 - 1.3 mmol/L
0 - 48 hours: 1.0 - 1.20 mmol/L
2 - 30 days: 1.0 - 1.5 mmol/L
1 - 6 months: 0.95 - 1.5 mmol/L
0 - 48 hours: 1.0 - 1.20 mmol/L
2 - 30 days: 1.0 - 1.5 mmol/L
1 - 6 months: 0.95 - 1.5 mmol/L
Clinical Significance
Ionized calcium (Ca++) is the physiologically active form of calcium, which comprises approximately 45% of the total calcium in plasma. In critical care situations, especially where large amounts of blood are being transferred, ionized calcium levels should be monitored closely. Transfused blood typically contains citrate as an anticoagulant that can bind ionized calcium and affect its level in the blood. Although total calcium levels may increase, Ionized calcium may decrease and lead to cardiac and neuromuscular malfunction.
