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Test Code VBG Blood Gases, Venous, LAB79

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred: Heparinized syringe with venous blood.

Acceptable: Dark Green Heparinized tube (must be full)

Specimen Volume:150 uL of heparinized blood

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

Collection Instructions: Specimen must be kept as anaerobic as possible.

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: 23.3-28\9.7 mmol/L

Females: 22.3-28.4 mmol/L

% O2 saturation: 70-80%

Day(s) Test Set Up

Monday through Sunday

Useful For

Blood gas analyses are usually performed for the assessment of either the acid-base status or the respiratory oxygenation status of the patient. 

Test Classification and CPT Coding



Ion-Selective Electrode (ISE)

Includes pH, pCO2, pO2, bicarbonate (HCO3), CO2, base excess, and % O2 saturation.