How does a pulse oximeter work? Small beams of light pass thr | World of Knowledge

How does a pulse oximeter work?

Small beams of light pass through the blood in the finger, measuring the amount of oxygen. It does this by measuring changes of light absorption in oxygenated or deoxygenated blood. This is a painless process. The pulse oximeter will thus be able to tell you your oxygen saturation levels along with your heart rate.