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Test Code ABGS Blood Gases, Arterial, LAB76

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred: Heparinized syringe with arterial 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 minutes.

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

Reference Values

pH: 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: 34-45 mm Hg

Females: 31-42 mm Hg
pO2: 80-90 mm Hg
Critical values

0-23 months: <50 mm Hg or >300 mm Hg

≥2 years: <50 mm Hg or >200 mm Hg

HCO3: 22-26 mmol/L

Males: 24-30 mm Hg

Females: 21-30 mm Hg

Base excess: -2 to +2 mmol/L
% O2 saturation: 94-97%

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. 

Arterial blood is the specimen of choice when evaluating the body's respiratory system.

Day(s) Test Set Up

Monday through Sunday


Ion-Selective Electrode (ISE)

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

Test Classification and CPT Coding