A 55-year-old female asked:
Why would my oxygen levels fall from 99 to 87 when exercising. I'm using a pulse oximeter. ?
1 doctor answer
Dr. Geoffrey Rutledge answered
40 years experience in Internal Medicine
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 on Jan 20, 2016
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