Mindray PM-50, Operation Manual

Page: 27 / 60

Measurement
21
Figure 4-4 Placing Neonatal SpO
2
Sensor 3
4.4 Measuring Restrictions
If the accuracy of any measurement seems unreasonable, first check
the patient’s vital signs by an alternate method, and then check the
device for proper function.
Inaccurate measurements may be caused by the following reasons.
Incorrect sensor application or use;
Significant levels of dysfunctional hemoglobins (e.g.,
carboxyhemoglobin or methemoglobin);
Intravascular dyes such as indocyanine green or methylene
blue;
Exposure to excessive illumination, such as surgical lamps
(especially ones with a xenon light source), bilirubin lamps,
fluorescent lights, infrared heating lamps, or direct sunlight
(exposure to excessive illumination can be corrected by
covering the sensor with a dark or opaque material);
Venous pulsations;
Excessive patient movement;