Should Thyroid Test Be Done on Empty Stomach?
Generally, You Don't Need to Fast Before Doing a Thyroid Function Test. However, Not Fasting Is Sometimes Linked to a Lower Tsh Level. This Means Your Results...
Generally, you don't need to fast before doing a thyroid function test. However, not fasting is sometimes linked to a lower TSH level. This means your results might not pick up on mild (subclinical) hypothyroidism — where your TSH levels are only mildly elevated.
Do you have to fast for a thyroid blood test?
Most doctors will suggest you do not fast before your thyroid function test. Research shows that fasting, especially early in the morning, may impact TSH levels. A fasting test typically results in higher TSH levels versus one done in the afternoon.
What is the best time to take thyroid test?
I recommend getting your thyroid function tests done first thing in the morning, bringing your medications with you, and taking them right after you have your thyroid function tests to ensure that you get accurate test results.