serum triiodothyronine

Triiodothyronine is a hormone synthesized and secreted by thyroid follicular cells. In addition to synthesis in the thyroid gland, triiodothyronine is mainly converted from thyroxine in peripheral tissues. Although the concentration of triiodothyronine is much lower than that of thyroxine, the biological activity of triiodothyronine is 3 to 5 times higher than that of thyroxine. Triiodothyronine is a specific indicator for the diagnosis of hyperthyroidism, and it has important reference value for estimating the recurrence of hyperthyroidism. Basic Information Specialist classification: growth and development check classification: biochemical examination Applicable gender: whether men and women apply fasting: fasting Tips: Before the inspection, you must stop eating foods rich in iodine, such as kelp, seaweed, sea fish and shrimp, etc., depending on the amount of food, stop eating for 2-4 weeks. Normal value Newborns 1.2 to 4. Onmol / L. 1 to 5 years old 1.5 to 4. Onmol / L. 6 to 10 years old 1.4 to 3.7 nmol / L. 11 to 15 years old 1.2 to 3.2 nmol / L. After 15 years old, 1.8 to 2.9 nmol/L. > 60-year-old male 1.6 to 2.7 nmol/L. Female 1.7 ~ 3.2nmol / L. Clinical significance Reduced in hypothyroidism, hypothyroxin-binding globulinemia. Elevation is seen in hyperthyroidism, early stage of triiodothyronine-type hyperthyroidism crisis, iodine-deficient goiter, and high thyroid-binding globulinemia. Precautions 1. Before the inspection, you must stop eating foods rich in iodine, such as kelp, seaweed, sea fish and shrimp, etc., depending on the amount of food, stop eating for 2 to 4 weeks. 2. The following drugs should be stopped before the examination. According to the dosage and time, stop taking 2~8 weeks. (1), iodine-containing drugs, such as iodide, compound iodine solution, iodine-containing tablets, etc. (2) Drugs that affect thyroid function, such as thyroid tablets and antithyroid drugs. (3) Some Chinese herbal medicines, such as seaweed, kelp, fritillary, burdock, Mutong, etc. 3. The patient should be fasted on the day of the examination. Inspection process The operation process is shown in Table 1. Not suitable for the crowd No taboos. Adverse reactions and risks Subcutaneous hemorrhage: subcutaneous hemorrhage due to less than 5 minutes of compression time or blood draw technique.