Arterial Blood Gas (ABG) Normal Lab Values

 Arterial Blood Gases (ABGs) are measured in a laboratory test to determine the extent of compensation by the buffer system. It measures the acidity (pH) and the levels of oxygen and carbon dioxide in arterial blood. Blood for an ABG test is taken from an artery whereas most other blood tests are done on a sample of blood taken from a vein. To help you interpret ABG results, check out our 8-Step Guide to ABG Analysis Tic-Tac-Toe Method.

Normal Lab Values for Arterial Blood Gases

  • pH: 7.35 – 7.45
  • HCO3: 22 – 26 mEq/L
  • PCO2: 35 – 45 mmHg
  • PaO2: 80 – 100 mmHg
  • SaO2: >95