User Manual for Handheld Pulse Oximeter
27
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 Alarm 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
alarm limit of the oximeter is set as 90% generally.
4 Factors affecting SpO
2
measuring accuracy (interference
reason)
Intravascular dyes such as indocyanine green or
methylene blue
Exposure to excessive illumination, such as surgical
lamps, bilirubin lamps, fluorescent lights, infrared
heating lamps, or direct sunlight.