Do you have to fast for thyroid labs?

As someone managing hypothyroid for 5 years, yes, you must fast overnight. Also, do not take your thyroid pill before the blood draw—take it right after. Make sure you get tested every 6 months and show the reports to your doctor to adjust the dosage if needed.

Don't just rely on online advice for these things because every lab has different guidelines and some tests might be combined with other parameters. Call your doctor's clinic or the specific pathology lab directly and ask them what preparation they want you to do. That's the only safe way.

Beta, please go for the test without eating anything in the morning. Our doctor tells us that even a little tea can change the results, and then the medicine dose might get messed up. Go early in the morning, give the blood, and then have your tea.

I completely understand how stressful even a simple blood test can feel, I used to get so anxious before mine. Yes, fasting is usually required, but it's very simple. Just sleep well, go early, and you'll be done in five minutes. You've got this, don't worry.