Pulse oximetry is a noninvasive, painless test that measures the oxygen saturation level of your blood. Here’s how it works ...

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A pulse oximeter measures your blood oxygen levels and pulse. A low level of oxygen saturation may occur if you have certain health conditions. Your skin tone may also affect your reading.

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Medically reviewed by Jeffrey S. Lander, MDMedically reviewed by Jeffrey S. Lander, MD Pulse oximetry is a quick and noninvasive test that measures the oxygen saturation level in your blood using ...