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How much oxygen is in your body right now. A pulseoximeter attaches to a body part such as a finger, toe or ear to visualize the oxination of your blood with the use of a light emitting diode (LED) that transmits through the body tissue and compares the light absorption in the oxgenated and deoxgenated blood.
Patients that have asthma, COPD, pneumonia, lung cancer, anemia, heart failure, Covid or congential heart defect often use a pulse oximter.