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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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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