Thyroid testing — should I take my medication on the morning of a thyroid blood test?
No, do not take your thyroid medication prior to testing. Test first, then pop your medication. Also, make sure to test first thing in the morning while TSH is near its high point. Link below about testing and taking morning meds. Link states “Blood Tests1 If you take thyroid supplement medication on the day of your blood test, you should wait until after the blood has been drawn so as to avoid any test interference. Once the blood has been drawn, you may take that day’s dose and return to your regular dosing schedule.
