Sign in →

Test Code CBG Capillary Blood Gas

Important Note

Place specimen in outside pocket of a pre-filled biohazard bag of ice, then put into a separate biohazard bag for transport.

Clinical System Name

Capillary Blood Gas

Sample Requirements

Specimen: Whole Blood

Container(s):  Capillary Blood Gas Tube

Preferred Vol: 2 Capillary Blood Gas Tubes.  (EPOC capillary tubes are not acceptable).

Minimum Vol:  2 Capillary Blood Gas Tubes


Note: Capillary blood gas tubes must be filled completely and mixed thoroughly to dissolve and disperse the heparin. Place specimen in separate bag from ice, then place specimen bag into bag of ice. Deliver to Lab immediately, avoid air bubbles.  Ideally, whole blood specimens should be analyzed within 15 minutes of blood draw.



Processing Instructions

Reject due to: Inadequately filled specimens, air bubbles, visible clots, age of specimen

Spin: N

Aliquot: N

Temp: On ice

Storage Location: Deliver to Core Lab Rapidpoint bench.


Off-site collection: Samples must be drawn at Children's. Contact Laboratory (206) 987-2617 for additional information.



Specimen Type Temperature Time
 Capillary Blood Gas Tube RT 15 m
Capillary Blood Gas Tube 0-4o C 30 m
 Capillary Blood Gas Tube -20o C or -70oC No



STAT Performed TAT
Y 24/7 15 M


Performing Laboratory

Seattle Children's Laboratory    


Department:  Core Rapidpoint/Chemistry

Phone Number: 206-987-2617

Reference Range


Age pH pCO2 pO2
0-3 days* 7.31 - 7.47 28 - 49 33 - 61
Arterial Reference Ranges All Ages 7.35 - 7.45    
4 days - 1 month   26 - 40  
1 month - adult   35 - 45  
0 - 2 days     60 - 70
2 days - adult     80 - 100

** CBG reference ranges in patients greater than 3 days approximate arterial reference values. Neonatal capillary gas ranges from: Cousineau J, Anctil S et al. Neonate capillary blood gas reference values. Clinical Biochemistry 2005;38:905-907.


Method: Potentiometric method using standard ion-selective electrode (ISE) technology, Modified potentiometric method based on the principles of the Severinghaus electrode, Amperometric measurement based on the principles of the Clark electrode on Seimens RAPIDPOINT 405

Analytical Volume:  2 Capillary Blood Gas Tubes

CPT Codes


Critical Values


Age pH
All Ages


≥ 7.60



Age HCO3 (mmol/L)
All Ages


≥ 40



Age pCO2 (mmHg)
All Ages


≥ 70