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Foreword
Difference from the SaO
2
value to displayed value
<Table 1> <Table 2>
Sa
O
2
HbCO
Sa
O
2
Methemoglobin
1% 5% 10% 1% 5% 10%
50 50
70 70
90 90
100 100
Measured value is alway
s
lower than the actual value.
Displayed value is sometimes
higher than the actual value if
Sa
O
2
is around 50%.
-0.1 -0.7 -1.5 +0.2 +1.3 +3.2
-0.2 -0.8 -1.6 -1.5 -6.0 -9.6
-0.1 -0.7 -1.5 -0.6 -2.3 -3.2
-0.2 -0.8 -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 fi nger nails are polished
When fi nger nails are polished
•
Tables 1 and 2 below show the errors which may occur due to
these hemoglobins.