In this video you will see how to use or operate pulse oximeter properly to check spo2 or oxygen level in blood.
"Pulse oximeter does not identify COVID-19. It only shows the changes in the oxygen saturation in the blood, regardless of cause. However, the pulse oximeter is useful for monitoring oxygen levels at home, as falling oxygen saturation is an indication for hospitalization.
You can never say that your oximeter is 100% accurate. It can show a 2% over or 2% under due to your arterial blood gas or mechanical fault. Remember that while determining an emergency. For example, if your oxygen saturation is 96% according to a pulse oximeter, then it is anywhere between 94% and 98%.
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