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Thyroid(TSH) Tests

Thyroid(TSH) Tests

There are many different health problems associated with either an under-active or overactive thyroid gland so it is essential that basic thyroid function be tested regularly. The easiest way to do this is by testing for thyroid stimulating hormone (TSH).


Thyroid test is used to diagnose hyperthyroidism and hypothyroidism. This test is based on the presence of T3, T4 and TSH levels in the blood. The normal TSH levels in blood range between 0.5-5.5 mIU/ml. If the TSH levels are over 5.5 patient should be considered as a case of hypothyroidism i.e. having an under active thyroid. If the TSH levels are below 0.5, it is considered as a case of hyperthyroidism. TSH measurements are often supplemented with imaging tests, biopsies, clinical evaluation etc. Various symptoms like loss or gain of weight, blood pressure, facial features etc. are evaluated to diagnose hyper- or hypothyroidism. Hyperthyroidism patient are also evaluated by high blood pressure and rhythm irregularities like atrial fibrillation or palpitations. The core Needle Biopsy is done by obtaining a tissue sample for analysis from the patient with the help of a needle. It has a greater risk of bleeding associated complications but the test itself is more reliable and valid. In the Nuclear Scan method, a radioactive iodine uptake is made by giving a pill of iodine 123 to the patient and blood iodine levels are measured along with its uptake by thyroid.


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