User Manual for Handheld Pulse Oximeter
29
characteristics, SpO
2
can be determined. SpO
2
measured
by this oximeter is the functional oxygen saturation -- a
percentage of the hemoglobin that can transport oxygen. In
contrast, hemoximeters report fractional oxygen saturation
– a percentage of all measured hemoglobin, including
dysfunctional hemoglobin, such as carboxyhemoglobin or
metahemoglobin.
Clinical application of pulse oximeters: SpO
2
is an
important physiological parameter to reflect the respiration
and ventilation function, so SpO
2
monitoring used in
clinical becomes more popularly, such as monitoring the
patient with serious respiratory disease, the patient under
anesthesia during operation, premature and neonate. The
status of SpO
2
can be determined in time by measurement
and find the hypoxemia patient earlier, thereby preventing
or reducing accidental death caused by hypoxia effectively.
3 Normal SpO
2
Range and Default Low Limit
In campagna area, healthy people’s SpO
2
value is greater
than 94%, so the values below 94% are determined as
hypoxia. SpO
2
<90% is considered as the default threshold
for determining anoxia by most researchers, so SpO
2
low
limit of the oximeter is set as 90% generally.
4 Factors affecting SpO
2
accuracy (interference reason)
Intravascular dyes such a s indocyanine green or
methylene blue
Exposure to e xcessive illumination, such as surgical
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