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A member asked:
Why would my oxygen levels fall from 99 to 87 when exercising. i'm using a pulse oximeter. ?
A doctor has provided 1 answer
Lung condition: The lowered reading can be an error, depending on the quality of your pulse oximter. If the reading is valid then it may reflect a problem with your lungs or circulation - conditions such as asthma, COPD, pneumonia, and heart failure are common causes, but there are many others.
Answered 1/25/2021
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