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central sensitivity indices include the thyrotroph thyroxine resistance index (TT4RI) and TSH index (TSHI). The FT3/FT4 ratio reflects deiodinase activity and is a proxy for peripheral thyroid hormone sensitivity ( 21 ). Central resistance phenomena affect
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, such as comorbidities, older age and use of comedication [ 1 , 2 ]. Recently the relation between thyroid hormone and the coagulation system has gained interest as a focus of research [ 3 , 4 , 5 , 6 , 7 ]. High levels of free thyroxine (fT 4 ) are
Departments of Vascular Medicine, University of Amsterdam, Amsterdam
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thromboembolism (VTE) or bleeding. Higher plasma levels of free thyroxine (FT 4 ) have been associated with an increased VTE risk [ 1 , 2 , 3 ]. Conversely, lower levels of FT 4 seem to be associated with a bleeding tendency [ 4 , 5 ]. An observational cohort
Department of Endocrinology, Gateshead Health NHS Foundation Trust, Gateshead, UK
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in groups B (low FT3 and low CRP), C (medium FT3 and low, medium and high CRP) and D (high FT3 and high CRP) had an increased risk of subsequent mortality (hazard ratios between 1.42 and 1.52) compared to group E. Figure 4 T3 and CRP levels and
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Ruhr Center for Rare Diseases (CeSER), Ruhr University of Bochum and Witten/Herdecke University, Bochum, Germany
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ELISA (Anti-TSH-Receptor; EUROIMMUN AG, Luebeck, Germany). Interrelational Measures As a simple estimate of the conversion of T 4 to T 3 , we used the FT 3 -FT 4 ratio of the molar serum concentrations of the hormones. We divided FT 4 by TSH
Azienda USL, Modena, Italy
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, there were no differences among the three groups (respectively p = 0.71; p = 0.34). No significant differences were found in serum levels of fT 3 (p = 0.59), fT 4 (p = 0.16), Ab anti-TG (p = 0.48), fT 3 /fT 4 ratio (p = 0.76) and fT 3 /TSH ratio (p
Institut National de la Recherche Médicale, UMR U895, Université Nice-Sophia Antipolis, Nice, France
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5th or 10th percentile of the reference range for FT4 associated with normal TSH [ 3 , 4 ]. There is, however, the question of threshold for normal values, linked in part to the lack of laboratory reference ranges in pregnancy. The association of
Department of Medicine, King Chulalongkorn Memorial Hospital, Bangkok, Thailand
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Department of Preventive and Social Medicine, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
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Department of Preventive and Social Medicine, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
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F, Mamac RY, Yenigun M: FT 3 /FT 4 ratio predicts non-alcoholic fatty liver disease independent of metabolic parameters in patients with euthyroidism and hypothyroidism. Clinics (Sao Paulo) 2016;71:221-225. 10.6061/clinics/2016(04)08 27166773
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overnight fast. fT 4 levels were only evaluated in participants who presented altered TSH levels. In this study, reference range levels were 0.4-4.0 μIU/ml for TSH and 10.3-24.45 pmol/l for fT 4 , i.e. similar to those used in the National Health and
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week 27 (1.4 ng/mL [1.1; 1.7]), respectively. In contrast, in Ad-TSHR-immunized mice, fT4 concentrations were markedly higher at weeks 17 (4.4 ng/mL [3.9; 6]) and 27 (4.5 ng/mL [4.2; 6]) than in Ad-GFP-immunized mice (2 ng/mL [1.8; 2.1] and 1.4 ng/mL [1