"...An arterial blood gas is done on a patient to determine the amounts or Oxygen and Carbon Dioxide dissolved in the blood. Also to determine the Acid/Base status of the blood. The results reported and predicted normals are: pH 7.34 - 7.45, PO2 80 - 100 mmHg, PCO2 35 - 45 mmHg, HCO3 22 - 26 mEq/L, BE (-2) - (+2) mEq/L, O2 saturation > 95%, O2 content > 16 vol%, AaDO2 10 - 15 mmHg..."