SpO2 is measured using a small device called a pulse oximeter. The pulse oximeter is placed on the fingertip, earlobe, or toe and uses light to measure the amount of oxygen in the blood.
SpO2 readings are typically between 95% and 100%. A reading below 90% is considered low and may require medical attention.
However, it is important to note that SpO2 readings can be inaccurate in certain situations, such as:
* Poor circulation. If a person has poor circulation, the pulse oximeter may not be able to get an accurate reading.
* Skin pigmentation. Darker skin can make it more difficult for the pulse oximeter to get an accurate reading.
* Motion. If a person is moving, the pulse oximeter may not be able to get an accurate reading.
* Carbon monoxide poisoning. Carbon monoxide can bind to hemoglobin, the oxygen-carrying protein in red blood cells, and prevent it from carrying oxygen. This can lead to a falsely high SpO2 reading.
If you have a low SpO2 reading, it is important to see your doctor to determine the cause and receive treatment.