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Carmen Sydlik Division of Pediatric Endocrinology, Center for Pediatric and Adolescent Medicine Inn-Salzach-Rott, Altoetting, Germany

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Ilja Dubinski Division of Pediatric Endocrinology, Dr. von Hauner Children's Hospital, University Hospital Munich, LMU Munich, Munich, Germany

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Susanne Bechtold Division of Pediatric Endocrinology, Dr. von Hauner Children's Hospital, University Hospital Munich, LMU Munich, Munich, Germany

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Heinrich Schmidt Division of Pediatric Endocrinology, Dr. von Hauner Children's Hospital, University Hospital Munich, LMU Munich, Munich, Germany

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, as triiodothyronine/free triiodothyronine (T3/fT3) levels may be low ( 1 , 2 ). In healthy individuals, fT3 levels can be stable over a wide range of corresponding TSH levels ( 3 ). The regulation of thyroid hormones is reflected in an adjusting fT3

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Qiankai Jin Department of Endocrinology, The Affiliated Hospital of Medical School, Ningbo University, Ningbo, China
School of Medicine, Ningbo University, Ningbo, China

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Guoqing Huang Department of Endocrinology, The Affiliated Hospital of Medical School, Ningbo University, Ningbo, China
School of Medicine, Ningbo University, Ningbo, China

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Xiaoqing Tian Department of Endocrinology, The Affiliated Hospital of Medical School, Ningbo University, Ningbo, China
School of Medicine, Ningbo University, Ningbo, China

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Yimeng Shu Department of Endocrinology, The Affiliated Hospital of Medical School, Ningbo University, Ningbo, China
School of Medicine, Ningbo University, Ningbo, China

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Ximisinuer Tusongtuoheti Department of Endocrinology, The Affiliated Hospital of Medical School, Ningbo University, Ningbo, China
School of Medicine, Ningbo University, Ningbo, China

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Yushan Mao Department of Endocrinology, The Affiliated Hospital of Medical School, Ningbo University, Ningbo, China

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, and its evaluation in different regions and ethnicities is of importance. This study is part of the 2019 Zhejiang Zhenhai study, and the aim was to discuss the relationship between TSH, free triiodothyronine (FT3), FT4, and FT3/FT4 levels within the

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Xiaomin Nie Department of Endocrinology and Metabolism, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital; Shanghai Clinical Center for Diabetes; Shanghai Key Clinical Center for Metabolic Disease; Shanghai Diabetes Institute; Shanghai Key Laboratory of Diabetes Mellitus, Shanghai, China

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Yiting Xu Department of Endocrinology and Metabolism, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital; Shanghai Clinical Center for Diabetes; Shanghai Key Clinical Center for Metabolic Disease; Shanghai Diabetes Institute; Shanghai Key Laboratory of Diabetes Mellitus, Shanghai, China

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Xiaojing Ma Department of Endocrinology and Metabolism, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital; Shanghai Clinical Center for Diabetes; Shanghai Key Clinical Center for Metabolic Disease; Shanghai Diabetes Institute; Shanghai Key Laboratory of Diabetes Mellitus, Shanghai, China

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Yun Shen Department of Endocrinology and Metabolism, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital; Shanghai Clinical Center for Diabetes; Shanghai Key Clinical Center for Metabolic Disease; Shanghai Diabetes Institute; Shanghai Key Laboratory of Diabetes Mellitus, Shanghai, China

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Yufei Wang Department of Endocrinology and Metabolism, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital; Shanghai Clinical Center for Diabetes; Shanghai Key Clinical Center for Metabolic Disease; Shanghai Diabetes Institute; Shanghai Key Laboratory of Diabetes Mellitus, Shanghai, China

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Yuqian Bao Department of Endocrinology and Metabolism, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital; Shanghai Clinical Center for Diabetes; Shanghai Key Clinical Center for Metabolic Disease; Shanghai Diabetes Institute; Shanghai Key Laboratory of Diabetes Mellitus, Shanghai, China

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( 3 ). Free triiodothyronine (FT3) is the bioactive form of thyroxines. FT3 regulates basal metabolic rate, promotes fat decomposition and acts on the cardiovascular system through adrenergic signaling ( 4 ). Previous studies have found that a high

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Ling Sun Department of Cardiology, The Affiliated Changzhou No.2 People’s Hospital of Nanjing Medical University, Changzhou, Jiangsu, China
Section of Pacing and Electrophysiology, Division of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China

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Wenwu Zhu Department of Cardiology, Xuzhou Central Hospital, Xuzhou Clinical School of Nanjing Medical University, Xuzhou, Jiangsu, China

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Yuan Ji Department of Cardiology, The Affiliated Changzhou No.2 People’s Hospital of Nanjing Medical University, Changzhou, Jiangsu, China

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Ailin Zou Department of Cardiology, The Affiliated Changzhou No.2 People’s Hospital of Nanjing Medical University, Changzhou, Jiangsu, China

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Lipeng Mao Department of Cardiology, The Affiliated Changzhou No.2 People’s Hospital of Nanjing Medical University, Changzhou, Jiangsu, China
Dalian Medical University, Dalian, Liaoning, China

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Boyu Chi Department of Cardiology, The Affiliated Changzhou No.2 People’s Hospital of Nanjing Medical University, Changzhou, Jiangsu, China
Dalian Medical University, Dalian, Liaoning, China

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Jianguang Jiang Department of Cardiology, The Affiliated Changzhou No.2 People’s Hospital of Nanjing Medical University, Changzhou, Jiangsu, China

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Xuejun Zhou Department of Cardiology, The Affiliated Changzhou No.2 People’s Hospital of Nanjing Medical University, Changzhou, Jiangsu, China

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Qingjie Wang Department of Cardiology, The Affiliated Changzhou No.2 People’s Hospital of Nanjing Medical University, Changzhou, Jiangsu, China

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Fengxiang Zhang Section of Pacing and Electrophysiology, Division of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China

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.13(0.62, 2,12) 0.313 AKI, acute kidney injury; BNP, brain natriuretic peptide; DBP, diastolic blood pressure; FT3, free triiodothyronine; FT4, free thyroxine; LVEF, left ventricular ejection fraction; NSTEMI, non-ST segment elevation myocardial

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Beibei Zhu School of Public Health, Anhui Medical University, Hefei, Anhui, China
Key Laboratory of Population Health Across Life Cycle, Anhui Medical University, Ministry of Education of the People’s Republic of China, Hefei, Anhui, China
NHC Key Laboratory of Study on Abnormal Gametes and Reproductive Tract, Hefei, Anhui, China
Anhui Provincial Key Laboratory of Population Health and Aristogenics, Anhui Medical University, Hefei, Anhui, China

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Yan Han School of Public Health, Anhui Medical University, Hefei, Anhui, China
Key Laboratory of Population Health Across Life Cycle, Anhui Medical University, Ministry of Education of the People’s Republic of China, Hefei, Anhui, China
NHC Key Laboratory of Study on Abnormal Gametes and Reproductive Tract, Hefei, Anhui, China
Anhui Provincial Key Laboratory of Population Health and Aristogenics, Anhui Medical University, Hefei, Anhui, China

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Fen Deng School of Public Health, Anhui Medical University, Hefei, Anhui, China
Key Laboratory of Population Health Across Life Cycle, Anhui Medical University, Ministry of Education of the People’s Republic of China, Hefei, Anhui, China
NHC Key Laboratory of Study on Abnormal Gametes and Reproductive Tract, Hefei, Anhui, China
Anhui Provincial Key Laboratory of Population Health and Aristogenics, Anhui Medical University, Hefei, Anhui, China

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Kun Huang School of Public Health, Anhui Medical University, Hefei, Anhui, China
Key Laboratory of Population Health Across Life Cycle, Anhui Medical University, Ministry of Education of the People’s Republic of China, Hefei, Anhui, China
NHC Key Laboratory of Study on Abnormal Gametes and Reproductive Tract, Hefei, Anhui, China
Anhui Provincial Key Laboratory of Population Health and Aristogenics, Anhui Medical University, Hefei, Anhui, China

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Shuangqin Yan Ma’anshan Maternal and Child Health Care Center, Ma’anshan, Anhui, China

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Jiahu Hao School of Public Health, Anhui Medical University, Hefei, Anhui, China
Key Laboratory of Population Health Across Life Cycle, Anhui Medical University, Ministry of Education of the People’s Republic of China, Hefei, Anhui, China
NHC Key Laboratory of Study on Abnormal Gametes and Reproductive Tract, Hefei, Anhui, China
Anhui Provincial Key Laboratory of Population Health and Aristogenics, Anhui Medical University, Hefei, Anhui, China

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Peng Zhu School of Public Health, Anhui Medical University, Hefei, Anhui, China
Key Laboratory of Population Health Across Life Cycle, Anhui Medical University, Ministry of Education of the People’s Republic of China, Hefei, Anhui, China
NHC Key Laboratory of Study on Abnormal Gametes and Reproductive Tract, Hefei, Anhui, China
Anhui Provincial Key Laboratory of Population Health and Aristogenics, Anhui Medical University, Hefei, Anhui, China

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Fangbiao Tao School of Public Health, Anhui Medical University, Hefei, Anhui, China
Key Laboratory of Population Health Across Life Cycle, Anhui Medical University, Ministry of Education of the People’s Republic of China, Hefei, Anhui, China
NHC Key Laboratory of Study on Abnormal Gametes and Reproductive Tract, Hefei, Anhui, China
Anhui Provincial Key Laboratory of Population Health and Aristogenics, Anhui Medical University, Hefei, Anhui, China

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Introduction The thyroid gland experiences great stress during pregnancy, increasing about 10–40% in size, with the production of thyroxine (T4) and triiodothyronine (T3) surging by 50% ( 1 ). As a result, thyroid dysfunction such as

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Jiayang Lin Department of Endocrinology and Metabolism, Nanfang Hospital, Southern Medical University, Guangzhou, China

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Peizhen Zhang Department of Endocrinology and Metabolism, Nanfang Hospital, Southern Medical University, Guangzhou, China

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Yan Huang Department of Endocrinology and Metabolism, Nanfang Hospital, Southern Medical University, Guangzhou, China

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Xueyun Wei Department of Endocrinology and Metabolism, Nanfang Hospital, Southern Medical University, Guangzhou, China

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Dan Guo Department of Endocrinology and Metabolism, Nanfang Hospital, Southern Medical University, Guangzhou, China

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Jianfang Liu Department of Endocrinology and Metabolism, Nanfang Hospital, Southern Medical University, Guangzhou, China

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Deying Liu Department of Endocrinology and Metabolism, Nanfang Hospital, Southern Medical University, Guangzhou, China

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Yajuan Deng Department of Endocrinology and Metabolism, Nanfang Hospital, Southern Medical University, Guangzhou, China

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Bingyan Xu Department of Endocrinology and Metabolism, Nanfang Hospital, Southern Medical University, Guangzhou, China

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Chensihan Huang Department of Endocrinology and Metabolism, Nanfang Hospital, Southern Medical University, Guangzhou, China

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Xiaoyu Yang Department of Endocrinology and Metabolism, Nanfang Hospital, Southern Medical University, Guangzhou, China

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Yan Lu Department of Endocrinology and Metabolism, Zhongshan Hospital, Fudan University, Shanghai, China

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Lijing Jia Department of Endocrinology, Shenzhen People’s Hospital, The First Affiliated Hospital of Southern University of Science and Technology, Shenzhen, Guangdong, China

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Huijie Zhang Department of Endocrinology and Metabolism, Nanfang Hospital, Southern Medical University, Guangzhou, China

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) were measured using standard enzymatic methods. Total bilirubin (TBIL) and direct bilirubin (DBIL) were measured by diazotization method. Serum insulin, free triiodothyronine (T3), total T3, free thyroxine (T4), total T4, and TSH thyroid peroxide

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Brenda Anguiano Departamento de Neurobiología Celular y Molecular, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Campus Juriquilla, Querétaro, México

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Carlos Montes de Oca Departamento de Neurobiología Celular y Molecular, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Campus Juriquilla, Querétaro, México

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Evangelina Delgado-González Departamento de Neurobiología Celular y Molecular, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Campus Juriquilla, Querétaro, México

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Carmen Aceves Departamento de Neurobiología Celular y Molecular, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Campus Juriquilla, Querétaro, México

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mainly represented by tetraiodothyronine (T4) and triiodothyronine (T3), and both are essential for the development, maintenance, and metabolism of almost all tissues. The effects of THs on the target tissues are determined by factors that control their

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Josi Vidart Thyroid Section, Endocrine Division, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
Intensive Care Unit, Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil

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Paula Jaskulski Internal Medicine Division, Hospital de Clínicas de Porto Alegre, Internal Medicine Department, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil

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Ana Laura Kunzler Internal Medicine Division, Hospital de Clínicas de Porto Alegre, Internal Medicine Department, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil

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Rafael Aguiar Marschner Thyroid Section, Endocrine Division, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil

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André Ferreira de Azeredo da Silva Internal Medicine Division, Hospital de Clínicas de Porto Alegre, Internal Medicine Department, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil

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Simone Magagnin Wajner Thyroid Section, Endocrine Division, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
Internal Medicine Division, Hospital de Clínicas de Porto Alegre, Internal Medicine Department, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil

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(77.8%) and 2 (13.4%) CABG, coronary artery bypass grafting; fT3, free triiodothyronine; fT4, free thyroxine; ICU, intensive care unit; MV, mechanical ventilation; rT3, reverse triiodothyronine; T3, triiodothyronine; T4, thyroxine; TSH

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Stine Linding Andersen Department of Clinical Biochemistry, Aalborg University Hospital, Aalborg, Denmark
Department of Clinical Medicine, Aalborg University, Aalborg, Denmark

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Louise Knøsgaard Department of Clinical Biochemistry, Aalborg University Hospital, Aalborg, Denmark
Department of Clinical Medicine, Aalborg University, Aalborg, Denmark

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Aase Handberg Department of Clinical Biochemistry, Aalborg University Hospital, Aalborg, Denmark
Department of Clinical Medicine, Aalborg University, Aalborg, Denmark

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Peter Vestergaard Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
Department of Endocrinology, Aalborg University Hospital, Aalborg, Denmark
Steno Diabetes Center North Jutland, Aalborg University Hospital, Aalborg, Denmark

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Stig Andersen Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
Department of Geriatrics, Aalborg University Hospital, Aalborg, Denmark

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with lower fT3 and TT3. Table 3 The association between maternal BMI and smoking status in pregnancy and different measures of maternal thyroid thyroxine (T4) and triiodothyronine (T3) in the early pregnancy. n Free T4 index (nmol

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Chun-feng Lu Department of Endocrinology, Affiliated Hospital 2 of Nantong University and First People’s Hospital of Nantong City, Nantong, China

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Wang-shu Liu Department of Endocrinology, Affiliated Hospital 2 of Nantong University and First People’s Hospital of Nantong City, Nantong, China

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Xiao-qin Ge Department of Endocrinology, Affiliated Hospital 2 of Nantong University and First People’s Hospital of Nantong City, Nantong, China

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Feng Xu Department of Endocrinology, Affiliated Hospital 2 of Nantong University and First People’s Hospital of Nantong City, Nantong, China

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Jian-bin Su Department of Endocrinology, Affiliated Hospital 2 of Nantong University and First People’s Hospital of Nantong City, Nantong, China

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Xue-qin Wang Department of Endocrinology, Affiliated Hospital 2 of Nantong University and First People’s Hospital of Nantong City, Nantong, China

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Yan Wang Department of Geriatrics, Affiliated Hospital 2 of Nantong University and First People’s Hospital of Nantong City, Nantong, China

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images, and biochemical indicators (each criterion must be met: low thyroid-stimulating hormone – TSH, high free triiodothyronine – FT3, high free thyroxine – FT4, elevated TSH receptor antibody – TRAb) ( 14 ). The exclusion criteria were as follows: (1

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