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Left shift of the oxygen-haemoglobin dissociation curve

Authoring team

 

Line graph showing the percent saturation of hemoglobin with oxygen (vertical axis) versus partial pressure of oxygen (horizontal axis) indicating conditions of higher and reduced hemoglobin-oxygen affinity.

Oxygen dissociation to the left is shifted by lower CO2, higher pH and lower temperature.

Oxygen dissociation is shifted to the left by fetal haemoglobin. The fetal haemoglobin appears to have similar affinity for oxygen to adult human haemoglobin; however there appears to be a low binding of 2,3 DPG to fetal haemoglobin.

 

Line graph comparing oxygen saturation levels of fetal hemoglobin and adult hemoglobin as a function of oxygen partial pressure (pO2)

The curve is shifted irreversibly to the left with carbon monoxide.


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