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Introduction: The pre-analytical phase encompasses the procedures prior to the performance of the laboratory tests, which are the physician’s requisition, patient and tests registration, collection and transport of samples. This phase involves different professionals and is responsible for the majority of the laboratory errors. Objective: To assess the pre-analytical phase of a public laboratory through quality indicators (QI). Method: Nonconformities (NC) in the physician’s requisitions and in the patients and tests registrations were evaluated during the quality checking process. A questionnaire was applied to evaluate the service and the satisfaction of the laboratory’s client. The QI were calculated considering the number of NC in the processes in relation to the total opportunities, compared with specifications described in the literature and evaluated by the Sigma metric. Results: The pre-analytical phase was evaluated by 34 QI. From these, 18 presented Sigma score lower than 3.0, six between 3.0 and 4.0, six above 4.0 and four presented Sigma score of 6.0. The completiton of requisitions presented worse performance than the process of tests registration. Regarding the three stages of the pre-analytical phase evaluated, the scheduling presented the worst performance, followed by the service at the reception and the sample collection. Conclusion: The evaluation of the QI allowed organizing the improvements that should be prioritized in the laboratory. The Sigma metric was useful for assessing the QIs considered important to the laboratory, for which there are no published specifications. The questionnaire for evaluating the laboratory’s service and client’s satisfaction was not a reliable tool for assessing the quality of the pre-analytical phase.

Assessment of the pre-analytical phase of a clinical analyses laboratory