Mindray SV300 - Measurement Limitations

8-4
8.5 Measurement Limitations
If you doubt the measured SpO
2
, check patient vital signs first. Then check the patient
ventilator 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 immeasurable level caused by shock, anemia, low
temperature or vasoconstrictor.