The Thyroid Pentathlon requires a blood test. The Thyroid Pentathlon is a test that evaluates thyroid function and consists of five items: thyroxine (T4), thyroid stimulating hormone (TSH), free thyroxine (FT4), triiodothyronine (T3), and free triiodothyronine (FT3). The five tests are used to diagnose hyperthyroidism and hypothyroidism. A blood sample is drawn from a vein for this test. Before the FT5 test, you should avoid foods with high iodine content and endocrine drugs, and keep your mood calm to avoid insomnia and emotional stress. If you are undergoing treatment for thyroid disease, you need to have regular checkups and adjust the dosage of medication according to the results of the checkups. If you are suffering from hyperthyroidism, hypothyroidism and other thyroid diseases, it is recommended to go to the hospital, under the guidance of the doctor to carry out thyroid function tests, to clarify the cause of the disease and then standardize the treatment.