What is the oxygen hemoglobin dissociation curve?

Updated: Apr 07, 2020
  • Author: Ata Murat Kaynar, MD; Chief Editor: Michael R Pinsky, MD, CM, Dr(HC), FCCP, FAPS, MCCM  more...
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Answer

The quantity of oxygen combined with hemoglobin depends on the level of blood PaO2. This relationship, expressed as the oxygen hemoglobin dissociation curve, is not linear but has a sigmoid-shaped curve with a steep slope between a PaO2 of 10 and 50 mm Hg and a flat portion above a PaO2 of 70 mm Hg.


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