Triiodothyronine

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Related to Free Triiodothyronine: free thyroxine, FT3, Ft³, Free T4

Triiodothyronine

 

(3,5,3’-triiodothyronine), an animal and human hormone formed in the follicles of the thyroid gland by the oxidative condensation of monoiodotyrosine and diiodotyro-sine.

Like the other thyroid hormone, thyroxine, triiodothyronine has a multiple, varied effect on the organism and on the organism’s growth, differentiation, and metabolism. It is secreted into the blood in significantly smaller amounts than thyroxine, but its effect on metabolism is more rapid, since it is less strongly bound to specific plasma proteins and thus enters the tissue fluid and cells more easily.

References in periodicals archive ?
Simultaneous quantification of free triiodothyronine and free thyroxine by isotope dilution tandem mass spectrometry.
There was significant difference in procalcitonin, brain natriuretic peptide, D-dimer, troponin I, Hb, blood urea nitrogen (BUN), albumin, lactate, glucose, free triiodothyronine (FT3), free thyroxine (FT4), HCT, and 24 h urine volume between two groups ( P < 0.
11] The tests covered by this group are total thyroxine (TT4), total triiodothyronine (TT3), free thyroxine (FT4), free triiodothyronine (FT3), and thyroid-stimulating hormone (TSH).
Thyroid function tests confirmed hyperthyroidism with a serum free triiodothyronine (FT3) level of 13,4 pg/ml (1,7-4,9), serum free thyroxin (FT4) level of 5,4 ng/dl (0,7-2,0) and thyrotropine (TSH) level of <0.
The analytical validity and standardization of free thyroxine (FT4) and free triiodothyronine (FT3) testing, however, has been a matter of ongoing debate (6-16).
Report of the IFCC Working Group for Standardization of Thyroid Function; part 2: free thyroxine and free triiodothyronine.
We have read with interest recent reports of the measurement of free thyroxine and free triiodothyronine by ultrafiltration and tandem mass spectrometry (1-4).