Thyroid blood tests require fasting, which is generally required for routine blood draws for elective procedures. Thyroid blood tests include routine blood tests, liver function, kidney function, electrolytes, blood glucose, lipids, thyroid function, i.e. T3, T4, TSH, as well as coagulation, hepatitis B five, and pre-transfusion routine, which includes hepatitis C, HIV, and syphilis. In addition, thyroglobulin and thyroid antibodies should be checked. If surgical removal is required, fasting from food and water is also required 1 day prior to surgery, usually for more than six hours.