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Triiodothyronine or T3 is a hormone produced by the thyroid gland. The T3 blood test helps doctors diagnose thyroid disease. High or low T3 levels may indicate hyperthyroidism or hypothyroidism. The T3 test is most helpful in diagnosing hyperthyroidism. They are not very helpful in diagnosing hypothyroidism.
There are two forms of the T3 hormone.
A test that measures both bound and free T3 is called a total T3 test.
A doctor may order a T3 test if a child's symptoms or previous blood tests suggest thyroid dysfunction. The T3 test is particularly useful in diagnosing hyperthyroidism, a condition in which the thyroid gland produces too much hormone, causing symptoms such as increased heart rate, weight loss, shivering, and sweating.
No special preparation is required for this test. However, certain medications such as anticonvulsants, steroids, and oral contraceptives can affect results, so it's important to tell your doctor about any medications your child is taking.
A healthcare worker typically cleanses the surface of the skin with an antiseptic, places an elastic band (tourniquet) around the upper arm and applies pressure to inflate the vein with blood, and then draws blood from the vein. A needle is inserted into a vein (usually inside the arm, elbow, or back of the hand) and blood is drawn into a vial or syringe.After the blood is drawn, the needle is removed and the affected area is covered with cotton or a bandage to stop the bleeding.
Higher than normal T3 levels usually indicate hyperthyroidism. Hyperthyroidism has several causes, including Graves' disease (an autoimmune disease), thyroid nodules, and thyroiditis (inflammation of the thyroid).
Hyperthyroidism speeds up your metabolism and can be detrimental to your health. Symptoms of hyperthyroidism include:
Lower than normal T3 levels may indicate hypothyroidism. In addition, some people with severe hypothyroidism have high TSH levels and low free T4 levels, but normal T3 levels.
Early check ups are always better than delayed ones. Safety, precaution & care is depicted from the several health checkups. Here, we present simple & comprehensive health packages for any kind of testing to ensure the early prescribed treatment to safeguard your health.