A female asked:
i had a cmp done at doctors . everything was normal except anion gap at 3. my blood urea nitrogen at 21 . ( doc said cuz i fasted).. why is this low?
1 doctor answer
Dr. Douglas Arenberg answered
30 years experience Pulmonary Critical Care
First things 1st.: Why did you have the test? No test should be interpreted in a vacuum. Most of the time the abnormality described is pretty meaningless. But attempting to answer your question requires we know about your medical history.
Answered on Feb 11, 2016
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