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Joke Marlier Department of Endocrinology, Ghent University Hospital, Ghent, Belgium

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Guy T’Sjoen Department of Endocrinology, Ghent University Hospital, Ghent, Belgium
Department of Internal Medicine & Pediatrics, Ghent University, Ghent, Belgium

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Jean Kaufman Department of Endocrinology, Ghent University Hospital, Ghent, Belgium
Department of Internal Medicine & Pediatrics, Ghent University, Ghent, Belgium

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Bruno Lapauw Department of Endocrinology, Ghent University Hospital, Ghent, Belgium
Department of Internal Medicine & Pediatrics, Ghent University, Ghent, Belgium

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/kg body weight, aiming for free thyroxine serum levels (fT4) prior to intake in the upper part of normal reference ranges ( 1 ). However, variability in TH absorption and metabolism, concomitant treatments and inaccurate interpretation of TSH levels still

Article Type:
Research Article
Collections:
Hypothyroidism
DOI:
https://doi.org/10.1530/ETJ-21-0128
Volume/Issue:
Volume 11: Issue 6
Open access
Roberto Fiore Division of Endocrinology, Diabetes and Metabolism, University Hospital of Lausanne and University of Lausanne, Hôtel des Patients, Lausanne, Switzerland

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Stefano La Rosa Unit of Pathology, Department of Medicine and Surgery, University of Insubria, Varese, Italy

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Silvia Uccella Unit of Pathology, Department of Medicine and Surgery, University of Insubria, Varese, Italy

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Deborah Marchiori Unit of Pathology, Department of Medicine and Surgery, University of Insubria, Varese, Italy

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Peter A Kopp Division of Endocrinology, Diabetes and Metabolism, University Hospital of Lausanne and University of Lausanne, Hôtel des Patients, Lausanne, Switzerland

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4.5 mU/L (reference range 0.27-4.2 mU/L), with normal levels of fT4 (16 pmol/L, reference range 12.0–22.0 pmol/L) and fT3 (4 pmol/L, reference range 3.1–6.8 pmol/L) ( Table 1 ). He was subsequently started on systemic therapy with the tyrosine kinase

Article Type:
Case Report
Collections:
Hypothyroidism
DOI:
https://doi.org/10.1530/ETJ-22-0006
Volume/Issue:
Volume 11: Issue 5
Open access
Paolo Cavarzere Pediatric Division, Department of Pediatrics, University Hospital of Verona, Verona, Italy

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Laura Palma Pediatric Division, Department of Pediatrics, University Hospital of Verona, Verona, Italy

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Lara Nicolussi Principe Pediatric Division, Department of Pediatrics, University Hospital of Verona, Verona, Italy

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Monica Vincenzi Pediatric Section, Department Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
Regional Center for Newborn Screening, Diagnosis and Treatment of Congenital Metabolic and Endocrinological Diseases, Verona, Italy

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Silvana Lauriola Neonatal Intensive Cure Unit, Department of Pediatrics, University Hospital of Verona, Verona, Italy

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Rossella Gaudino Pediatric Division, Department of Pediatrics, University Hospital of Verona, Verona, Italy
Pediatric Section, Department Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy

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Virginia Murri Pediatric Division, Hospital of San Bonifacio, Verona, Italy

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Luigi Lubrano Pediatric Division, Hospital of Legnago, Verona, Italy

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Giuliana Rossi Pediatric Division, Hospital of Mestre, Venezia, Italy

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Alessia Sallemi Pediatric Division, Hospital of Venezia, Venezia, Italy

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Ermanna Fattori Pediatric Division, Hospital of Negrar, Verona, Italy

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Marta Camilot Pediatric Section, Department Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
Regional Center for Newborn Screening, Diagnosis and Treatment of Congenital Metabolic and Endocrinological Diseases, Verona, Italy

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Franco Antoniazzi Pediatric Division, Department of Pediatrics, University Hospital of Verona, Verona, Italy
Pediatric Section, Department Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
Regional Center for the Diagnosis and Treatment of Children and Adolescents Rare Skeletal Disorders, Pediatric Clinic, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy

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( 17 , 18 ), we considered thyroid function as normal in the newborn when FT4 was in the reference range in the presence of a TSH level below 6 mU/L; in these cases, no further tests were required. When FT4 was in the reference range and TSH level was

Article Type:
Research Article
Collections:
Hypothyroidism
DOI:
https://doi.org/10.1530/ETJ-22-0060
Volume/Issue:
Volume 11: Issue 5
Open access
Kamilla R Riis Department of Endocrinology, Odense University Hospital, Odense, Denmark
Department of Clinical Research, University of Southern Denmark, Odense, Denmark

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Camilla B Larsen Department of Endocrinology, Odense University Hospital, Odense, Denmark
Department of Clinical Research, University of Southern Denmark, Odense, Denmark

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Bjarke R Medici Department of Medicine, Copenhagen University Hospital – Herlev and Gentofte, Denmark

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Christian Z Jensen Department of Medicine, Copenhagen University Hospital – Herlev and Gentofte, Denmark

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Kristian H Winther Department of Endocrinology, Odense University Hospital, Odense, Denmark

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Emil L Larsen Department of Clinical Pharmacology, Bispebjerg-Frederiksberg Hospital, Copenhagen, Denmark

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Christina Ellervik Department of Laboratory Medicine, Boston Children’s Hospital, Harvard Medical School, Boston, United States of America
Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
Department of Data and Data Support, Region Zealand, Sorø, Denmark

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Jeppe L la Cour Department of Medicine, Copenhagen University Hospital – Herlev and Gentofte, Denmark

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Laszlo Hegedüs Department of Endocrinology, Odense University Hospital, Odense, Denmark
Department of Clinical Research, University of Southern Denmark, Odense, Denmark

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Thomas H Brix Department of Endocrinology, Odense University Hospital, Odense, Denmark

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Henrik E Poulsen Department of Endocrinology, Copenhagen University Hospital, Bispebjerg-Frederiksberg Hospital, Denmark
Faculty of Health Science, University of Copenhagen, Copenhagen, Denmark
Department of Cardiology, University Hospital Nordsjælland, Hillerød, Denmark

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Filip K Knop Department of Medicine, Copenhagen University Hospital – Herlev and Gentofte, Denmark
Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
Steno Diabetes Center Copenhagen, Herlev, Denmark
Center for Clinical Metabolic Research, Gentofte Hospital, University of Copenhagen, Hellerup, Denmark

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Birte Nygaard Department of Medicine, Copenhagen University Hospital – Herlev and Gentofte, Denmark
Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark

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Steen J Bonnema Department of Endocrinology, Odense University Hospital, Odense, Denmark
Department of Clinical Research, University of Southern Denmark, Odense, Denmark

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the reference range of 0.3–4.0 mIU/L and total plasma thyroxine (TT4) below the reference range of 60–130 nmol/L) or mild (plasma TSH above the reference range, and plasma TT4 within the reference range). Exclusion criteria were pregnancy or planned

Article Type:
Research Article
Collections:
Hypothyroidism
DOI:
https://doi.org/10.1530/ETJ-23-0167
Volume/Issue:
Volume 12: Issue 6
Open access
Maja Hjelm Lundgaard Department of Clinical Biochemistry, Aalborg University Hospital, Aalborg, Denmark

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Allan Carlé Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
Department of Endocrinology, Aalborg University Hospital, Aalborg, Denmark

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Ulla Birgitte Christiansen Department of Gynaecology and Obstetrics, Aalborg University Hospital, Aalborg, Denmark

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Anne Sørensen Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
Department of Gynaecology and Obstetrics, Aalborg University Hospital, Aalborg, Denmark

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Søren Risom Kristensen Department of Clinical Biochemistry, Aalborg University Hospital, Aalborg, Denmark
Department of Clinical Medicine, Aalborg University, Aalborg, Denmark

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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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diagnosis of hypothyroidism was made, treatment with levothyroxine (50 µg per day) was unaltered. Biochemical assessment revealed improvement in patient thyroid function and TSH as well as T4 and T3 were within the reference ranges at 6 months follow

Article Type:
Case Report
Collections:
Hypothyroidism
DOI:
https://doi.org/10.1530/ETJ-22-0109
Volume/Issue:
Volume 11: Issue 4
Open access
Cengiz Kara Department of Molecular Medicine, Institute of Graduate Studies, Ondokuz Mayis University, Samsun, Turkey
Department of Pediatric Endocrinology, Faculty of Medicine, Istinye University, Istanbul, Turkey

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Jamala Mammadova Pediatric Endocrinology Unit, Altinbas University Medicalpark Bahçelievler Hospital, Istanbul, Turkey

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Ümmet Abur Department of Molecular Medicine, Institute of Graduate Studies, Ondokuz Mayis University, Samsun, Turkey
Department of Medical Genetics, Faculty of Medicine, Ondokuz Mayis University, Samsun, Turkey

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Cagri Gumuskaptan Department of Molecular Medicine, Institute of Graduate Studies, Ondokuz Mayis University, Samsun, Turkey
Department of Medical Genetics, Faculty of Medicine, Ondokuz Mayis University, Samsun, Turkey

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Elif İzci Güllü Department of Pediatric Endocrinology, Faculty of Medicine, Ondokuz Mayis University, Samsun, Turkey

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Ayhan Dağdemir Department of Molecular Medicine, Institute of Graduate Studies, Ondokuz Mayis University, Samsun, Turkey

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Murat Aydın Department of Pediatric Endocrinology, Faculty of Medicine, Ondokuz Mayis University, Samsun, Turkey

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and free thyroxine (FT4) measurements, according to laboratory reference values (see supplementary material for reference ranges). All CH patients with low serum FT4 and/or persistently high (>10 µU/mL) TSH were treated with l -thyroxine (LT4). Two

Article Type:
Research Article
Collections:
Hypothyroidism
DOI:
https://doi.org/10.1530/ETJ-22-0212
Volume/Issue:
Volume 12: Issue 3
Open access
Frederick Keen Royal Glamorgan Hospital, Ynysmaerdy, Llantrisant, UK

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Anuja Chalishazar Royal Glamorgan Hospital, Ynysmaerdy, Llantrisant, UK

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Kelly Mitchem Royal Glamorgan Hospital, Ynysmaerdy, Llantrisant, UK

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Alan Dodd Royal Glamorgan Hospital, Ynysmaerdy, Llantrisant, UK

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Atul Kalhan Royal Glamorgan Hospital, Ynysmaerdy, Llantrisant, UK

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criteria. Age >16 years A low free T4 <11.0 pmol/L (reference range: 11–25) A low-normal or low TSH Referred to endocrinology for investigation Results A total of 151 TFTs results were identified using the pre

Article Type:
Research Article
Collections:
Hypothyroidism
DOI:
https://doi.org/10.1530/ETJ-21-0119
Volume/Issue:
Volume 11: Issue 2
Open access
Camilla Bøgelund Larsen Department of Endocrinology, Odense University Hospital, Denmark
Department of Clinical Research, University of Southern Denmark, Odense, Denmark

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Kristian Hillert Winther Department of Clinical Research, University of Southern Denmark, Odense, Denmark

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Per Karkov Cramon Department of Clinical Physiology and Nuclear Medicine, Copenhagen University Hospital Rigshospitalet, Copenhagen, Denmark

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Åse Krogh Rasmussen Department of Endocrinology and Metabolism, Copenhagen University Hospital Rigshospitalet, Copenhagen, Denmark

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Ulla Feldt-Rasmussen Department of Endocrinology and Metabolism, Copenhagen University Hospital Rigshospitalet, Copenhagen, Denmark
Institute of Clinical Medicine, Faculty of Health and Clinical Sciences, Copenhagen University, Copenhagen, Denmark

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Nils Jakob Knudsen Department of Endocrinology, Bispebjerg University Hospital, Copenhagen, Denmark

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Jakob Bue Bjorner Department of Public Health, Copenhagen University, Copenhagen, Denmark
QualityMetric Inc, Johnston, Lincoln, Rhode Island, USA

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Lutz Schomburg Institute for Experimental Endocrinology, Charité Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany

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Kamil Demircan Institute for Experimental Endocrinology, Charité Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany

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Thilo Samson Chillon Institute for Experimental Endocrinology, Charité Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany

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Jeppe Gram Medical Department, Endocrinology, University Hospital of South-West Jutland, Esbjerg, Denmark

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Stinus Gadegaard Hansen Medical Department, Endocrinology, University Hospital of South-West Jutland, Esbjerg, Denmark

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Frans Brandt Department of Clinical Research, University of Southern Denmark, Odense, Denmark
Internal Medicine Research Unit, University Hospital of Southern Jutland, Aabenraa, Denmark

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Birte Nygaard Department of Endocrinology, Herlev and Gentofte Hospital, University of Copenhagen, Copenhagen, Denmark

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Torquil Watt Department of Endocrinology and Metabolism, Copenhagen University Hospital Rigshospitalet, Copenhagen, Denmark
Institute of Clinical Medicine, Faculty of Health and Clinical Sciences, Copenhagen University, Copenhagen, Denmark

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Laszlo Hegedüs Department of Endocrinology, Odense University Hospital, Denmark
Department of Clinical Research, University of Southern Denmark, Odense, Denmark

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Steen Joop Bonnema Department of Endocrinology, Odense University Hospital, Denmark
Department of Clinical Research, University of Southern Denmark, Odense, Denmark

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the LT4 dose, aiming for a serum TSH level within the reference range. Inclusion criteria Inclusion criteria were age ≥18 years; diagnosis of AIT with serum TPOAb ≥100 kIU/L measured within the last 12 months; LT4 treatment based on an initial

Article Type:
Research Article
Collections:
Hypothyroidism
DOI:
https://doi.org/10.1530/ETJ-23-0175
Volume/Issue:
Volume 13: Issue 1
Open access
Anita Boelen Endocrine Laboratory, Department of Laboratory Medicine, Amsterdam UMC, location University of Amsterdam, Amsterdam, The Netherlands
Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam, The Netherlands
Amsterdam Reproduction & Development Research Institute, Amsterdam, The Netherlands

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Nitash Zwaveling-Soonawala Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam, The Netherlands
Department of Pediatric Endocrinology, Emma Children’s Hospital, Amsterdam UMC, location University of Amsterdam, Amsterdam, The Netherlands

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Annemieke C Heijboer Endocrine Laboratory, Department of Laboratory Medicine, Amsterdam UMC, location University of Amsterdam, Amsterdam, The Netherlands
Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam, The Netherlands
Amsterdam Reproduction & Development Research Institute, Amsterdam, The Netherlands
Endocrine Laboratory, Department of Laboratory Medicine, Amsterdam UMC, location Vrije Universiteit Amsterdam, Amsterdam, The Netherlands

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A S Paul van Trotsenburg Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam, The Netherlands
Department of Pediatric Endocrinology, Emma Children’s Hospital, Amsterdam UMC, location University of Amsterdam, Amsterdam, The Netherlands

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concentrations within the reference range. Furthermore, patients detected at a later age had normal neurological development which implies that during childhood, TH was sufficiently produced. Clinical manifestations predominantly concern growth abnormalities ( 20

Article Type:
Review Article
Collections:
Hypothyroidism
DOI:
https://doi.org/10.1530/ETJ-23-0041
Volume/Issue:
Volume 12: Issue 4
Open access
Salman Razvi Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, United Kingdom

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Bronia Arnott Population Health Sciences Institute, Newcastle University, Newcastle upon Tyne, United Kingdom

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Dawn Teare Population Health Sciences Institute, Newcastle University, Newcastle upon Tyne, United Kingdom

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Shaun Hiu Population Health Sciences Institute, Newcastle University, Newcastle upon Tyne, United Kingdom

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Nicki O’Brien Department of Psychology, Northumbria University, Newcastle upon Tyne, United Kingdom

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Simon H. Pearce Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, United Kingdom

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Introduction Subclinical hypothyroidism (SCH) is a mild form of thyroid failure diagnosed when serum TSH levels are high and circulating thyroid hormones are within the reference range [ 1 , 2 ]. The prevalence of SCH increases with age and

Article Type:
Research Article
Collections:
Hypothyroidism
DOI:
https://doi.org/10.1159/000509228
Volume/Issue:
Volume 10: Issue 4
Free access