Sign in →

Test Code PH Cap pH Blood Capillary

Important Note

Capillary tubes must be completely filled with no air bubbles.

Clinical System Name

pH Blood Capillary


pH Blood

Sample Requirements

Specimen: Capillary 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:  Draw site must be warmed for 10 minutes.  Fill the tube completely with no air bubbles and mix thoroughly to dissolve and disperse the heparin.  Cap it securely.  Deliver to the Lab on ice.

Processing Instructions

Reject due to

  1. Inadequately filled specimens
  2. Specimens with air bubbles
  3. Specimens with visible clots
  4. Age of specimen


Spin:  N

Aliquot: N


Off-site collection:  Cannot be collected outside Children's. Contact Laboratory for additional information.



Specimen Type Temperature Time
Capillary Blood RT

10 minutes

Capillary Blood 2-8oC

30 minutes

Capillary Blood -20o C or -70oC



STAT Performed TAT
Y 24/7 15 Minutes


Performing Laboratory

Seattle Children's Laboratory    


Department:  Core Chemistry

Phone Number: 206-987-2617



Reference Range

0-1 M 7.31 - 7.47



Method:  Potentiometric method by Rapidpoint 405 Blood Gas Analyzer

Analytical Volume:  0.2 mL Capillary Blood

CPT Codes


Critical Values

≤ 7.20

≥ 7.60