Labs: The most common test to screen for thyoid problems is to get blood work. The usual test would include TSH (thyroid stimulating hormone), t4, free t3 (liothyronine). Tsh comes from your brain and tells your throid gland to secrete t4. T4 is activated to T3 (liothyronine) in your liver (80%) and other tissue in your body. T3 (liothyronine) is what gets into your cells and tells your cells to "speed up".
Answered 1/15/2015
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