Re: Does the blood test for TSH/TPO/Tg need to be done on an empty stomach?
Fasting is not required for thyroid tests. Having the blood drawn in the a.m. only matters if your doctor diagnoses solely by TSH. TSH is usually highest at about 3 a.m. until it starts falling again around dawn. If your MD goes only by TSH, you are less likely to get a diagnosis if your TSH has fallen to within range when the test is being done. If your MD actually knows more than that about thyroid and knows that free T4/T3 are the hormones that matter, it probably doesn't matter at all when the test is done.