How to read thyroid labs? 1, the most common check is T3, T4, FT3, TF4 and TSH. T3, T4 are thyroid hormones secreted by the thyroid gland, they can be combined with proteins in the blood serum, but to play a role, it is necessary to separate them from the proteins in the blood, so the determination of free thyroxine FT3, FT4 better reflects the function of the thyroid gland. TSH is a thyroid stimulating hormone secreted by the pituitary gland of the brain, it is like a dispatcher sent by the brain to regulate the work of the thyroid gland, if there is less thyroxine in the body, that is, when the thyroid gland is hypothyroidized, the TSH will be elevated to promote the production of a little bit more thyroxine by the thyroid gland; on the contrary, hyperthyroidism patients have too much thyroxine in the body, so the TSH will be reduced to a very low level. 2, some antibody indicators such as TPO-Ab, TG-Ab and TR-Ab. Patients with chronic inflammation of the thyroid gland need to check TPO-Ab and TG-Ab, because these two indicators reflect the patient’s inflammatory state, sometimes after a period of treatment, these two indicators may decline, but generally will not fall to normal. For patients who are suspected of having hyperthyroidism, TR-Ab should also be examined, and abnormal elevation may indicate primary hyperthyroidism. In addition to the above eight indicators, sometimes doctors will prescribe calcitonin (CT), thyroglobulin (TG), parathyroid hormone (PTH) and other indicators for different patients, and the meaning of the specific indicators should be analyzed in the context of the disease.