Thyroglobulin 5 is more comprehensive and accurate than Thyroglobulin 3, but the price is slightly higher. It is recommended to choose the appropriate test for your condition under the guidance of your doctor. Thyroid function tests generally include thyroid stimulating hormone (TSH), free thyroxine (FT4), and free triiodothyronine (FT3), which can generally reflect the function of the thyroid gland, and are suitable for preliminary screening of hyperthyroidism, hypothyroidism and other diseases. In addition to the 3-item test, the 5-item test also includes thyroxine (TT4) and triiodothyronine (TT3), which are more comprehensive and can more accurately determine the presence of hypothyroidism and hyperthyroidism than the 3-item test. Since there are two more tests than the TT3, the price is slightly higher than the TT3. Patients who need to undergo thyroid function tests should go to the hospital and ask the doctor to make a judgment based on their own situation and choose the most suitable test for them.