How do you properly use a pulse oximeter?

A pulse oximeter functions by using light to measure the amount of oxygen in the blood as well as the heart rate. The most effective sites for a pulse oximeter include areas where the skin is thin and there is good blood flow, which facilitates more accurate readings. Placing the device on a finger, toe, or earlobe corresponds with these criteria, allowing the infrared light emitted by the sensor to pass through the tissue and interact with the blood effectively.

Using these sites ensures that the pulse oximeter can accurately gauge the levels of oxygen saturation in the bloodstream. On the other hand, the forehead, wrist, or neck do not provide the optimal conditions for measurement, as they may not have the same level of blood perfusion or may be affected by ambient light interference. Therefore, placing the pulse oximeter on a finger, toe, or earlobe is best practice for obtaining a reliable reading.