If there is any question about the possibility of hypothyroidism, then I would suggest that additional testing beyond TSH would be best. TSH is a pituitary hormone that is affected by so many variables that it is totally inadequate as the sold diagnostic for thyroid. At best it is an indicator, to be considered along with more important indicators such as symptoms, and also the levels of Free T3 and Free T4. Free T3 is actually the most important because it largely regulates metabolism and many other body functions. Scientific studies have also shown that Free T3 correlated best with hypo symptoms, while Free T4 and TSH did not correlate.
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