What are normal arterial blood gases (ABGs) results?

Updated: May 14, 2020
  • Author: Kevin McCarthy, RPFT; Chief Editor: Nader Kamangar, MD, FACP, FCCP, FCCM  more...
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Answer

Answer

In healthy subjects breathing room air at sea level, the normal PaO2 (mm Hg) is affected by age, body mass index (BMI), PaCO2 (mm Hg), and posture (upright vs supine). [4] An average decline in PaO2 of 10 mm Hg occurs for each decade of life up to approximately 75 years.

Normal PaO2 can be predicted by the following equation:

Normal resting, room air PaO2 = 104 – (0.27 × age) + 7 mm Hg


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