Thyroid test: Tsh is a hormone released by the pitutary gland and is negatively cycled in response to thyroid hormone levels, high levels of thyroid cause a drop in TSH and vica versa. The range of TSH is affected by physiological factors such as sleep , circadian variation, food intake and sleep but within the narrow range you quote there is also variations due to measurement called interassay variation.
Answered 11/3/2017
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