beautypg.com
9
Foreword
Difference from the SaO
2
value to displayed value
SaO
HbCO
Methemoglobin
1%
5%
10%
50
70
90
100
Measured value is alwayslower than the actual value.
Displayed value is sometimeshigher than the actual value if
is around 50%.
-0.1
-0.7
-1.5
+0.2
+1.3
+3.2
-0.2
-0.8
-1.6
-6.0
-9.6
-0.6
-2.3
-3.2
-1.7
-1.8
-7.5
-12.2
•
When influenced by abnormal hemoglobin like carbon
monoxide hemoglobin (HbCO) and methemoglobin
When pigments such as cardiogreen, intravascular dyes
and indocyanine greenare present in the blood
When finger nails are polished
Tables 1 and 2 below show the errors which may occur due to
these hemoglobins.