The relation between oxygen saturation (spo, And oxygen partial pressure (pao, Torr or mmhg) is shown in the graph below. spo – Minolta Pulsox-2 User Manual
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Relation between Oxygen Saturation and Partial Pressure
The relation between oxygen saturation (SpO
2
, %) and oxygen partial
pressure (PaO
2
, torr or mmHg) is shown in the graph below. SpO
2
is
the oxygen saturation as measured by pulse oximeters.
Oxygen Saturation vs. Oxygen Partial Pressure
10
0
10
20
30
40
50
60
70
80
90
100
110
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)