use spo2 sensor to test the spo2 always do not readings has below reasons

use spo2 sensor to test the spo2 always happened below problems

when patient index finger put into the spo2 sensor to test the spo2 ,the signal is tracked to the pulse,the screen can not show the pulse 

there are some reason may happened this

1,patients with excessive mobility, too restless, so that blood oxygen saturation parameters can not find a pulse

2,patients may be infused too low, such as limb temperature is too low, the peripheral cycle is too bad, so that the oxygen saturation parameters can not be measured and oxygen saturation and pulse rate;

3,spo2 sensor damaged

4,spo2 sensor position is not accurate

5,blood stains (such as the United States blue, fluorescein), skin color or fingernail coated with nail polish, will also affect the measurement accuracy;

6,the environment has a strong light source. Such as surgical lights, fluorescent lights or other direct light, the probe will make the photosensitive element of the acceptance value from the normal range, so the need to avoid light. If necessary, the spo2 probe needs to be shaded;

7,after the spo2 sensor wear time is too long, may affect the blood circulation, so that measurement accuracy affected;

8, In addition, the same side of the arm blood pressure measurement, it will affect the peripheral cycle of the measured value of the error.