11-5
11.5 Measurement Limitations
If you doubt the measured SpO
2
, check patient vital signs first. Then check the patient
monitor and SpO
2
sensor. The following factors may influence the accuracy of measurement:
 Ambient light
 Physical movement (patient and imposed motion)
 Diagnostic testing
 Low perfusion
 Electromagnetic interference, such as MRI environment
 Electrosurgical units
 Dysfunctional haemoglobin, such as carboxyhemoglobin (COHb)and methemoglobin
(MetHb)
 Presence of certain dyes, such as methylene and indigo carmine
 Inappropriate positioning of the SpO
2
sensor, or use of incorrect SpO
2
sensor
 Drop of arterial blood flow to immeaurable level caused by shock, anemia, low
temperature or vasoconstrictor.
11.6 Troubleshooting
This section lists the problems that might occur. If you encounter the problems when using
the equipment or accessories, check the table below before requesting for services. If the
problem persists, contact your service personnel.
CAUTION
z Never try to disassemble the equipment or supplied accessories. There are no
internal user-serviceable parts.
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