This curve describes the relationship between available oxygen and amount of oxygen carried by hemoglobin.
Changes from these values are called "shifts".
Click a button to shift the curve.
A left shift will increase oxygen's affinity for hemoglobin.
SaO2 will increase at a given PaO2, but more of it will stay on the hemoglobin and ride back through the lungs without being used. This can result in tissue hypoxia even when there is sufficient oxygen in the blood.
A right shift decreases oxygen's affinity for hemoglobin.
This means more O2 will be released to the cells, but it also means less oxygen will be carried from the lungs in the first place.
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