A triiodothyronine (T3) test is a blood test that measures the levels of the hormone triiodothyronine in the blood. Triiodothyronine is one of the thyroid hormones produced by the thyroid gland and is involved in regulating metabolism, energy levels, and growth and development in the body.
The T3 test is typically used to diagnose thyroid disorders such as hyperthyroidism (overactive thyroid) or hypothyroidism (underactive thyroid), as well as to monitor treatment for these conditions. Abnormal levels of triiodothyronine in the blood can indicate thyroid dysfunction and may require further testing or treatment.
During the test, a healthcare provider will draw a blood sample from a vein in your arm using a small needle. The sample will be sent to a lab for analysis, and results are usually available within a few days.
It is important to follow any instructions provided by your test provider before the test, such as fasting or avoiding certain medications, in order to ensure accurate results.
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