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Relation between Oxygen Saturation and Partial Pressure
The relation between oxygen saturation (SpO2, %) and oxygen partial
pressure (PaO
2, torr or mmHg) is shown in the graph below. SpO2 is
the oxygen saturation as measured by pulse oximeters.
Oxygen Saturation vs. Oxygen Partial Pressure
10
0 102030405060708090100110
20
30
40
50
60
70
80
90
85
100
%
Torr
(mmHg)
PaO
2
pH=7.4
37°C
Adult hemoglobin
Oxygen Partial Pressure
Oxygen Partial Pressure SpO
2
The curve of the above graph may shift to the right or left according
to the pH of the blood or the body temperature. (Shift to right: acidosis,
high body temperature; shift to left: alkalosis, low body temperature)