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2021-12-13

National Institute of Locomotor diseases and Disabilities, Budapest, Hungary; Department of Laboratory Medicine, Semmelweis University, Budapest, Hungary. Electronic address: nagy.eszter@orfi.hu.; Immunologia Allergologia, Dipartimento di Medicina di Laboratorio, Ospedale San Giovanni di Dio Azienda, Usl Toscana Centro, Florence, Italy.; Laboratorio di Patologia Clinica, Ospedale San Antonio (Tolmezzo), Azienda Sanitaria Universitaria Integrata, Udine, Italy.; Division of Immunology and Transfusion Medicine, Department of Laboratory Medicine, University Hospital of North Norway, Tromsø, Norway.; Department of Clinical Chemistry, Medical Immunology Laboratory, Amsterdam Infection & Immunity, Amsterdam UMC, Vrije Universiteit Amsterdam, the Netherlands.; Department of Microbiology, Immunology and Transplantation, KU Leuven and Laboratory Medicine, University Hospital Leuven, Belgium.; Department of Immunology, Centre Hospitalier Lyon Sud, Hospices Civils de Lyon, Lyon, France.; Individual Laboratory for Rheumatologic Diagnostics, Pomeranian Medical University in Szczecin, Szczecin, Poland.; Medical Immunology, Laboratory Medicine, University Hospital Basel, Basel, Switzerland.; Medical University of Innsbruck, Department of Internal Medicine II, Rheumatology Laboratory, Innsbruck, Austria.; Department of Laboratory Diagnostics, University Hospital Centre Zagreb, Zagreb, Croatia.; Central Laboratory, East Tallinn Central Hospital, Tallinn, Estonia.; Servicio de Inmunología, Hospital Universitario Marqués de Valdecilla-IDIVAL, Universidad Cantabria, Santander, Spain.; The Sahlgrenska Academy at University of Gothenburg, Institution of Medicine, Department of Rheumatology and Inflammation Research, Gothenburg, Sweden; Sahlgrenska University Hospital, Department of Clinical Immunology and Transfusion Medicine, Gothenburg, Sweden.; Centro de Medicina Laboratorial Germano de Sousa, Lisboa, Portugal.; Immunology-Histocompatibility Department, "Evangelismos" General Hospital of Athens, Greece.; Central Diagnostic Laboratory, Maastricht University Medical Center, Maastricht, the Netherlands.CN - European Autoimmunity Standardisation Initiative

INTRODUCTION: The first wave of COVID-19 pandemic has disrupted almost all areas of the health care services to some extent throughout the world. Although the negative impact of COVID-19 on patients with autoimmune diseases has also been recognized, available data in this regard are limited. In the current study of the European Autoimmunity Standardisation Initiative (EASI) we aimed to provide reliable data on the extent of the impact of COVID-19 pandemic on test requests for different autoantibodies in European countries. METHODS: Data on test numbers and on the number of positive results were collected in 97 clinical laboratories from 15 European countries on a monthly basis for the year before (2019) and the year during (2020) the COVID-19 pandemic. RESULTS: A reduction in the number of autoantibody tests was observed in all European countries in the year 2020 compared to 2019. The reduction affected all autoantibody tests with an overall decrease of 13%, ranging from 1.4% (