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A member asked:
My t4 level is 12.5 & my tsh is 5.0 but my ques is some labs they r giving normal levels for t4 is 4.5-12.0 & in some labs they r giving it as4.5-12.5?
A doctor has provided 1 answer
more complicated: Analysis is more complicated. The TSH is the test to watch. The T4 cannot be evaluated by itself. One needs a t3 (liothyronine) resin uptake, which identifies protein binding. So, the range is artificial, when looked at in isolation.
Answered 1/19/2017
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