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Total triiodothyronine (Total T 3) is rarely measured, having been largely superseded by free T3 tests. Total T3 is generally elevated in hyperthyroidism and decreased in hypothyroidism. [2] Reference ranges depend on the method of analysis. Results should always be interpreted using the range from the laboratory that performed the test.
Triiodothyronine, also known as T 3, is a thyroid hormone. It affects almost every physiological process in the body, including growth and development, metabolism, body temperature, and heart rate. [1] Production of T 3 and its prohormone thyroxine (T 4) is activated by thyroid-stimulating hormone (TSH), which is released from the anterior ...
Reference ranges (reference intervals ... Exceptions are mainly those values that denote total blood concentration, ... Free triiodothyronine (FT3) Normal adult: 0.2 ...
Triiodothyronine (T 3) and thyroxine (T 4) can be measured as free T 3 and free T 4, which are indicators of their activities in the body. [73] They can also be measured as total T 3 and total T 4, which depend on the amount that is bound to thyroxine-binding globulin (TBG). [73]
Free T4 and total T3 can be measured when hyperthyroidism is of high suspicion as it will improve the accuracy of the diagnosis. Free T4, total T3 or both are elevated and serum TSH is below normal in hyperthyroidism. If the hyperthyroidism is mild, only serum T3 may be elevated and serum TSH can be low or may not be detected in the blood. [14]
normal range 2-62 × 10 −9: chronic poisoning ... Triiodothyronine: free 2.3-6.6 × 10 −12: total (T3)
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Triiodothyronine (T 3 ... up" higher than normal levels of radioiodine. Normal ranges for RAI uptake are from 10 to 30%. ... of T4 to the more active T3 in the ...