O2 level i assume you mean O2 saturation. if it drops down to 36 that's very very dangerous. that means that somewhere somehow oxygen is not getting absorbed. usually this occurs in the lungs... with emphysema patients or lung cancer.... extreme chronic obstructive pulmonary disorder and the like. mind you when we get a patient in the 80's in the clinic we ship em off to the hispital. and most normal people are mid 90's not exceeding 100% of course.
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