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Published on: 09 Nov 2016 by tarunyadav8213
Thyroid test involves a series of blood tests such as- T3, T3RU, T4 and TSH that are used to measure the functions of the thyroid gland. The thyroid is a small gland
located in the lower – front part of the neck just below Adam's apple. The major functions of the thyroid gland is to produce hormones and regulate various important functions of the body such as metabolism, energy generation, and controlling the emotions.
Our thyroid gland produces two major types of hormones called – Triiodothyronine (T3) and thyroxine (T4).Sometimes, the thyroid gland doesn’t produce enough hormones. In
this situation, the person may experience symptoms such as weight gain, lack of energy and depression. This condition is known as hypothyroidism. On the other hand, when the gland produces excess hormones, the person may suffer from excessive weight loss, high level of anxiety, tremors, etc. This condition is known as Hyperthyroidism.
Therefore, a proper thyroid test is ordered by the doctors to check the level of thyroid in the body and to pinpoint the reason for the problem.
How is the test performed?
test is a simple blood test also known as venipuncture, in which the blood
is drawn from one of the veins of the arm and is sent to the laboratory for
Understanding the Results
Thyroxine (T4) and Thyroid Stimulating Hormone (TSH) Test-
In most of the thyroid function tests, T4 Test and TSH test are usually ordered by the doctors.
· A high level of Thyroxine test or T4 test indicates an over reactive thyroid, i.e., - Hyperthyroidism.
· A TSH test measures the level of thyroid-stimulating hormone in your blood. The normal measures range from 0.4 milli-international units of hormone per litre of blood (mlU/L).A high level of TSH indicates that one is suffering from hypothyroidism.
T3 Thyroid test-
The T3 blood test is done to check for the level of triiodothyronine hormone in the blood. This test is typically ordered if T4 tests and TSH tests indicate hyperthyroidism. The normal value of T3 test ranges from 100 to 200 nanograms of hormone per decilitre of the blood. An abnormally high level of T3 indicates that a person is suffering from a condition called Grave’s disease.
T3 Resin Uptake Results
Also known as T3RU, it is a blood test that measures hormone called Thyroxin-Binding Globulin (TBG). An abnormally high level of TBG indicates that one is suffering from
kidney problems. Whereas, an abnormally low level of TBG shows high level of estrogen in the body.
A Doctor may order other follow-up thyroid tests depending on the reactiveness of your thyroid gland. These include- Thyroid Uptake test or an Ultrasound test. These tests help in detecting any type of structural problems with the thyroid gland such as tumours. Also, some additional thyroid function tests can be ordered by the doctors to make sure that the medicines are functioning well or not.