trans-triiodothyronine (γT3, trans-T3)

Anti-triiodothyronine (rT3) is a product of thyroxine deiodination in peripheral tissues. It is commonly used clinically to detect thyroid secretion and peripheral blood thyroid hormone metabolism. Examination of anti-triiodothyronine is also used for the diagnosis and evaluation of thyroid dysfunction, especially for the assessment of hyperthyroidism. In hyperthyroidism, γT3 is more sensitive than T3 and T4. Clinically, γT3 is commonly determined by the RIA method. Basic Information Specialist classification: growth and development check classification: endocrine examination Applicable gender: whether men and women apply fasting: fasting Analysis results: Below normal: Found in thyroid dysfunction. Normal value: Anti-triiodothyronine: 0.2-0.8 nmol/L Above normal: Found in thyroid poisoning (extraocular hyperthyroidism, painless thyroiditis, subacute thyroiditis, etc.), low T3 syndrome, cord blood, newborn. negative: Positive: 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 0.2 to 0.8 nmol/L. Clinical significance Increase: Found in thyroid poisoning (extraocular hyperthyroidism, painless thyroiditis, subacute thyroiditis, etc.), low T3 syndrome, cord blood, newborn. Found in the elderly, hunger, stress and many systemic diseases such as malnutrition, severe hepatitis, kidney disease. reduce: Hypothyroidism (primary pituitary). Low results may be diseases: hyperthyroidism in the elderly, high hypothyroidism may be a disease: autonomic high-function thyroid adenoma considerations Taboo before inspection: 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. Requirements for inspection: Explain to the doctor the history of medication and the food that has been eaten recently. Inspection process Ordinary test tube fasting blood 2-3ml in time for inspection. Not suitable for the crowd Not suitable for people: People who took propylthiouracil, glucocorticoids, choledochrome and other drugs before the test. People with reduced hematopoietic function such as leukemia, various anemia, myelodysplastic syndrome, or people with thrombocytopenia should pay attention to blood draw, and should not take more or more blood. Adverse reactions and risks 1. After the blood is drawn, do not press the needle hole to avoid subcutaneous hematoma. If there is a small piece of bruise in the blood, it is slightly tender, please don't panic, you can do hot compress after 24 hours to promote the absorption of blood. The general small amount of congestion will gradually absorb in 3 to 5 days and the color will become lighter and return to normal. 2. After the blood draw, symptoms such as dizziness, vertigo, fatigue, etc. should be immediately supine, drink a small amount of syrup, and then undergo a physical examination after the symptoms are relieved.

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