Thyroid Function Test 5 does not usually require a fasting blood draw. Thyroid hormone levels include FT3, FT4, TT3, TT4 and TSH, which are mainly used to reflect the function of the thyroid gland. Thyroid hormone levels are relatively constant in the blood, and have nothing to do with the time of blood sampling. However, if liver function, blood lipids, blood sugar and other tests are to be performed at the same time, they need to be performed on an empty stomach. Patients should maintain a regular routine, good dietary habits, etc. before having the five-item thyroid function test. Patients are advised to ask their doctors whether they need to fast or not before taking the thyroid function test 5, under their doctor’s guidance, so as not to affect the subsequent tests.