On the morning of your blood test, it is generally best to hold your morning dose of Thyronorm and take it right after your blood is drawn to ensure your results are highly accurate. Routine thyroid tests do not require fasting, so you can eat and drink normally unless your doctor has ordered other fasting tests at the same time.
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Do I need to fast before my thyroid blood test, and is it okay to take my Thyronorm 150 mcg medication the day before?