A 32-year-old female asked:
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why do "normal" ranges differ between labs? how can a number be normal at one but low or high at another? how does this impact diagnosis?

1 doctor answer
Dr. Alvin Lin
Dr. Alvin Lin answered
30 years experience Geriatrics
Great question!!!: Seriously! it's an excellent question. "normal" reference ranges differ b/c different techniques & equipment are used. There's also plain ol' measurement error. For instance, you weight 110# at my office but 115# at home. You didn't gain or lose 5#. That's measurement error. What about kg vs lbs? Or si units vs american units (it's a science thing). Basic things are same from lab to lab. Esoteric.
Answered on Aug 14, 2013
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1 comment
Dr. Alvin Lin
Dr. Alvin Lin commented
30 years experience Geriatrics
Provided original answer
labs like Testosterone make it very difficult to arrive at diagnosis, especially if same lab/technique isn't used each & every time.
Aug 13, 2013

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