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Laboratory medicine plays a crucial role in patient care, contributing to approximately 70 % of clinical decisions. In collaboration with clinicians, laboratory medicine specialists perform analyses that are useful for diagnosis, screening and prevention. Laboratories are known for their efficiency, which is reached through a rigorous quality system. However, errors can occur, especially given the complexity of the total testing process. These errors may lead to severe consequences, such as incorrect diagnoses or delays in treatment. Errors can occur at every stage of the total testing process, those related to the pre-analytical phase being the most prevalent. To reduce medical errors related to laboratory processes, it is essential to provide training for medical and paramedical staff, optimize production automation, and leverage technological advancements. These considerations have led to the creation of a French Working Group on Sources of Errors in Laboratory Medicine, under the aegis of the French lean society of clinical chemistry and laboratory medicine (Société Française de Biologie Clinique - SFBC). The objectives of this working group are to produce an educational handbook on sources of errors in laboratory medicine, provide training for clinical chemists, and conducting applied research projects to better understand the mechanisms behind specific errors. Ultimately, the aim is to minimize errors and enhance the quality of laboratory tests.