Vitamin B12, folate, thyroid-stimulating hormone (TSH), triiodothyronine (T3), and tetraiodothyronine
(T4) values were not found in the control group of the clinical parameters given in Table 1.
Thyroperoxidase (TPO) is an enzyme involved in thyroid hormone synthesis, catalysing the oxidation of iodide on tyrosine residues in thyroglobulin for the synthesis of triiodothyronine and thyroxine (Tetraiodothyronine
Subclinical hypothyroidism (SCH) is defined as an elevated serum thyroid stimulating hormone (TSH) level in the context of normal triiodothyronine ([T.sub.3]) and tetraiodothyronine
([T.sub.4]) levels (7,8,9).
Iodine is an essential element in the synthesis of thyroid hormones--thyroxine, triiodothyronine, and tetraiodothyronine
. Iodine deficiencies lead to hypothyroidism, hair loss, and cause abortions.
Normal range Result T3 uptake 23-40% 37 T4 4.6-12 [micro]g/dl 11.8 Free thyroxine index 1.4-4.5 ng/dl 4.366 TSH 0.34-4.82 U/ml 3.81 T3 = serum triiodothyronine; T4 = serum tetraiodothyronine
; TSH = thyroid-stimulating hormone.
Patients' age, gender, coexistence of HT (Hashimoto's thyroiditis), TSH (thyroid-stimulating hormone), T4 (tetraiodothyronine
), T3 (triiodothyronine), TGAB (thyroglobulin antibody), TMAB (thyromicrosome antibody), ultrasonographic characteristics, and pathologic features were recorded.
A dose-dependent inverse association between DBP and both triiodothyronine (T3) and tetraiodothyronine
(T4) has also been reported in male rats (12).
The BW, Tc, and serum biological parameters (glucose [GLU], triglycerides [TRI], triiodothyronine [T3], tetraiodothyronine
[T4], follicle-stimulating hormone [FSH], luteinizing hormone [LH], and estradiol [E2]) of the birds reared under the natural cold environment were monitored.
In overt primary hypothyroidism, thyroid stimulating hormone (TSH) levels are high and T4 (tetraiodothyronine
) and T3 (triiodothyronine) levels are low.
Serum Triiodothyronine (T 3 ) and Tetraiodothyronine
(T4) were determined using Competitive ELISA methods 17,18 and TSH was analyzed by Sandwich ELISA method 19.