A member asked:

I was just wondering when are tsh levels the lowest?

A doctor has provided 1 answer

Thyroid lab tests: Tsh levels decrease as the free thyroid hormone levels in the blood increase. So if you develop an overactive thyroid gland and produce excessive thyroid hormone your TSH level will drop low. The same can occur if you are taking a thyroid hormone supplement for hypothyroidism and are taking more than what your body needs.

Answered 6/10/2014

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