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Blood Gas, Venous

Last modified by  jcayless  on  April 03, 2014 09:58 AM

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514

Includes:  pH, pCO2, pO2, Bicarbonate, Base Balance, O2 Saturation(measured)


Specimen Type
syringe on ice

EPIC Order
CPT Code(s)   82805
Group/Individual Test   Group
Laboratory   Core Laboratory
Tube Station   31
Specimen Routine: 1.0 mL in 3cc syringe w/ lyophilized heparin in BG Kit or SafePICO Collection Kit. 
PLEASE SPECIFY source;  See important COMMENTS
  micro: 0.5 mL in TB syringe w/ lyophilized heparin in BG Kit or full capillary kit;  PLEASE SPECIFY source;  See important COMMENTS
Availability Routine: 24 Hours/Day
    10 minutes
Reference Range Normal: See Table Below
  Critical: See Table Below

Deliver Immediately. The time between specimen collection and analysis should not exceed 30 minutes.
Syringes with needles attached will NOT be accepted
Heparinized capillary samples can be analyzed if at least 100 µL of clot-free blood is present.  Syringes may be obtained from Central Distribution.
If temperature-corrected results are required then see test
1646 (Blood Gas, Venous Temperature Corrected)

Oxygen saturation is a measure of the fraction of oxygenated hemoglobin in relation to the amount of hemoglobin capable of transporting oxygen. Oxygen saturation can be clinically misleading in the presence of dyshemoglobins such as carboxyhemoglobin and methemoglobin. This is because the oxygen-carrying capacity of the blood will be decreased but the saturation will often remain within reference limits.

Reference Ranges:  Blood Gases
  Reference Range Critical Range
pH 7.32-7.43 <7.20 or >7.65
pCO2 40-60 mmHg <20 or >65 mmHg
pO2 30-55 mmHg (at R.A.)  
HCO3 22-27 mmol/L  
BB ±2 mmol/L  
O2 Sat 40-85%  


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