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Relation between Oxygen Saturation and Partial Pressure
The relation between oxygen saturation (SpO
partial pressure (PaO
oxygen saturation as measured by pulse oximeters.
oxygen saturation as measured by pulse oximeters.
Oxygen Saturation vs. Oxygen Partial Pressure
■
%
100
90
85
80
70
60
50
40
30
SpO
2
20
10
0
10
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
•
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) is shown in the graph below. SpO
2
20
30
40
50
pH=7.4
37°C
60
70
80
90
PaO
2
) and oxygen
2
is the
2
100
110
Torr
(mmHg)
29
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