The five tests include thyroxine, serum triiodothyronine (T3) and serum free thyroxine (FT4) as well as free triiodothyronine (FT3) and thyrotropin, which are referred to as the five thyroid tests. These five tests are not very expensive at about$135, so if you find symptoms such as eye protrusion or sweating, short temper, palpitations, or panic attacks, try to get a thyroid test to clarify the diagnosis. Because the T3, T4, FT3, FT4 increase, consider the occurrence of diseases such as hyperthyroidism, and promptly deal with hyperthyroidism when it occurs to avoid unnecessary thyroid crisis or thyroid heart disease.