F9 and F9 Express Fetal & Maternal Monitor User Manual Maternal Monitoring
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1 Select the setup key on the main interface.
2 Select Recorder > SpO
2
Trace.
3 Select ON or OFF (default).
4 Select OK.
9.2.4 Assessing the Validity of a SpO2 Reading
You can check the quality of the pleth wave and the stability of the SpO
2
values to assess whether
the sensor functions properly and whether the SpO
2
readings are valid. Always use these two
indications simultaneously to assess the validity of a SpO
2
reading.
NOTE:
1 The SpO
2
accuracy has been validated in human studies against arterial blood
sample reference measured with a CO-oximeter. Pulse oximeter measurements are
statistically distributed, only about two-thirds of the measurements can be expected
to fall within the specified accuracy compared to CO-oximeter measurements. The
volunteer population in the studies composed of local healthy men and women from
age 19 to 37, with variations of skin pigmentations. The SpO
2
accuracy is as follows:
±2% for 90%-100% and ±4% for 70%-90%.
2 The pulse rate accuracy is obtained by comparison to the pulse rate generated with
an arterial oxygen simulator (also an electronic pulse simulator).
3 Generally, the quality of the SpO
2
pleth wave reflects the quality of the light signals
obtained by the sensor. A wave of poor quality manifests a decline of the signal
validity. On the other hand, the stability of the SpO
2
values also reflects the signal
quality. Different from varying SpO
2
readings caused by physiological factors,
unstable SpO
2
readings are resulted from the sensor’s receiving signals with
interference. The problems mentioned above may be caused by patient movement,
wrong sensor placement or sensor malfunction. To obtain valid SpO
2
readings, try to
limit patient movement, check the placement of the sensor, measure another site or
replace the sensor.
9.2.5 SI (Signal Intensity)*
*Only applicable to the EDAN module
The signal intensity (SI) shows perfusion in numeric, and it reflects the pulse intensity of the
measurement site. The SI ranges from 0 to 10, with a larger value indicating the more intense
signal. When the SI value reaches 10, the signal quality is optimal. If the SI value is less than 2, it
indicates that the pulse at the current site is weak, and you should change the measurement site.
The SI value is displayed in the SpO
2
parameter area.
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