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P50, O2 Dissociation
MessagePerforming Lab: Regions
Test Code
RH0176
Alias/See Also
Sunquest: P50; Oxygen Dissociation
CPT Codes
82820
Preferred Specimen
1.0 mL Heparinized Blood (Blood Gas Syringe)
Minimum Volume
0.5 mL
Other Acceptable Specimens
Heparinized Capillary
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.)
HP Clinics & Sartell - order CAI to Quest
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
24.5 - 27.5 mmHg
Clinical Significance
The P50 represents the partial pressure of oxygen at which the hemoglobin oxygen saturation (SO2) is 50%. The P50 is a measure of the O2Hb binding characteristics and identifies the position of the oxygen-hemoglobin dissociation curve at half saturation
