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Appendix
Relation between Oxygen Saturation and Partial Pressure
The relation between oxygen saturation (SpO
2
) and oxygen
partial pressure (PaO
2
) is shown in the graph below. SpO
2
is the
oxygen saturation as measured by pulse oximeters.
oxygen saturation as measured by pulse oximeters.
■
Oxygen Saturation vs. Oxygen Partial Pressure
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
10
0 10 20 30 40 50 60 70 80 90 100 110
20
30
40
50
60
70
80
90
85
100
SpO
2
%
Torr
(mmHg)
PaO
2
pH=7.4
37
°C