Background: Inborn errors of immunity (IEIs) are more than 500 different rare congenital disorders of the immune system characterized by susceptibility to infections and immune dysregulation. The significant overlap of the clinical features among the different forms may lead to diagnostic delay. High throughput sequencing techniques may allow a timely genetic definition. Guidelines for the use and the interpretation of genetic testing produced by the American College of Medical Genetics and Genomics (ACMG) and the European Society of Human Genetics (ESHG) do not cover specificities for the application to IEIs.
Objective: The aim of this consensus study is to define the best approach to genetic testing for IEIs.
Methods: A panel of experts in the context of the Italian Primary Immunodeficiency Network (IPINet) composed a list of statements that were evaluated using Delphi method.
Results: The experts recommend that genetic testing for IEIs should be offered to selected patients with warning signs for IEIs and highlight the crucial role of thorough phenotyping and functional tests for the conclusive diagnosis of IEI. Comprehensive educational programs targeted to health care professionals and the public should be developed to increase IEIs awareness and reduce the diagnostic delay. Ethical issues should be pondered over the diagnostic advantages of genetic tests requested for diagnostic purposes.
Conclusion: Adherence to the guidelines on the use and interpretation of genetic testing for the diagnosis of IEIs should help limiting the inappropriate use of these techniques and reduce the risk of misdiagnosis and apprehension for inconclusive genetic results.
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