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Test Code CBG Blood Gases, Capillary, LAB78

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred: Heparinized plastic capillary tube

Acceptable: Heparinized glass caraway tube

Specimen Volume: 65 uL of capillary blood (full tube)

Stability: Samples should be placed in ice water if they can not be run within 30 min.

Collection Instructions:Specimens should be collected with out the introduction of air bubbles into

          the sample and mixed thoroughly during collection to prevent clotting.

Reference Values


7.35-7.45 units
Critical values

0-30 days: <7.2 units or >7.5 units

≥1 month: <7.2 units or >7.6 units

Males: 35-48 mm Hg

Females: 32-45 mm Hg

pO2: 83-108 mm Hg


Base excess: -2 to +2 mmol/L

HCO3: 25-28 mmol/L


Males: 23.3-29.7 mmol/L

Females: 22.3-28.4 mmol/L

% O2 saturation: 94-98%

Day(s) Test Set Up

Monday through Sunday

Useful For

Capillary blood gases are performed for the assessment of either the acid-base status or the respiratory oxygenation status of a patient.


Potentiometric Sensors: Includes pH, and pCO2.

Amperometric Sensors: Includes pO2

Test Classification and CPT Coding