Blood tests for patients with hypothyroidism need to be combined with the patient’s labs to determine whether or not to fast. If the lab test is for thyroid function, fasting is not required. If the patient’s laboratory tests for liver function, blood lipids, fasting blood sugar and other indicators, fasting is required.
Thyroid function test is a common test for checking thyroid disease, which can directly understand whether the indicators of the thyroid gland are within the normal range, and can help diagnose thyroid disease and determine the efficacy of treatment. Eating does not affect the thyroid function test, so there is no need to fast when drawing venous blood for the thyroid function test.
Fasting is required for tests such as liver function, blood lipids, and fasting blood glucose, and eating will have an effect on these tests.
If you are not sure which tests require fasting, it is recommended that you consult a healthcare professional.