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UW Health SMPH
American Family Children's Hospital

UW Hospital and Clinics Lab Test Directory

Test Name: Blood Gases and O2 Saturation

Test Code(s): BGASOS / HCBGASOS

CPT Code(s): 82805

Test Description: Test Components: pH, pCO2, pO2, base excess, actual bicarbonate, oxygen saturation and oxygen content.

Methodology: Electrode/Spectrophotometry

Days Performed: Daily, 24 hours.

Turnaround Time: Stat: Up to 30 minutes. All requests processed stat.


Specimen Requirements

Specimen: Arterial, venous, or capillary

Patient Preparation: None.  For venous samples on outpatients, send patient to UWHC Outpatient Phlebotomy to be drawn.

Collection Instructions: Radiometer "PICO"® syringes must be free of bubbles and clots. Two full Radiometer capillaries free of air bubbles and clots are needed for capillary blood.

Collection Container: Preferred: Radiometer PICO® syringe
Also Acceptable: 2 full Radiometer capillary tubes

Collection Volume: Preferred: 1.5 mL
Pediatrics: 0.5 mL

Sample Analyzed: Whole Blood

Volume Required: Preferred: 1.5 mL
Pediatrics: 0.5 mL

Specimen Transport: Transport specimen to UWHC Core Lab (B4/220) immediately.  Specimen must arrive in the Core Lab within 30 minutes of collection.

Unacceptable Criteria: Clotted specimens, specimens with air, or specimens past stability time are not acceptable.

Stability: Ambient: 1 hour
Frozen: Not acceptable


Interpretation

Reference Interval:

Arterial:

 

pH

1 day to 10 days:

7.29-7.45
  11 days and up:

7.36-7.44

     
pCO2

0 days-23 months:

27-41 mmHg

 

 

24 months and up: 

 

34-46 mmHg  

   

 

pO2, resting 1 day and up:  80-90 mmHg 
     

Base

Excess

0 days to 30 days: -10.0 to -2.0 mmol/L
  31 days to 12 months -7.0 to -1.0 mmol/L
  1 year to 17 years: -4.0 to +2.0 mmol/L
  18 years and up:  -2.5 to +2.5 mmol/L 
     

Actual

Bicarbonate

0 days to 30 days: 17.0-24.0 mmol/L

 

 31 days to 60 days: 19.0-24.0 mmol/L

 

 2 months to 2 years: 16.0-24.0 mmol/L

 

 3 years and up:   22.0-26.0 mmol/L 

 

   

Oxygen

saturation

0 days to 30 days: 85.0-90.0%
  31 days and up: 95.0-98.0% 
     

Oxygen

content

 1 year and up:   15.0-22.0 mL/dL 

 

Critical Calls: View

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