Drug interference plays an important role in the laboratory routine because of the probability of interfering with the assays and modifying the clinical-laboratory diagnosis. It is the professional clinical analyst responsible for detecting such interference in order to avoid misdiagnoses and erroneous clinical interventions. The aim of this study was to evaluate the possible interferences of the drug simvastatin in biochemical laboratory tests. A retrospective descriptive study was carried out between April and July 2015. Laboratory tests performed by patients with dyslipidemia and users of a specific drug were evaluated using the services provided by the Municipal Laboratory of Clinical Analysis of Santo Antônio de Posse, SP, Brazil. A questionnaire was applied to the volunteer participants to evaluate the lifestyle and the time of use of the drug. The enzymes Phosphatase Alkaline, Creatinophosphokinase (CPK), Aspartate Aminotransferase (AST) and Alanine Aminotransferase (ALT) were analyzed. The results showed that among 43 patients tests, 69.8% presented alterations in at least one of the exams evaluated. There was a change in the ALT enzyme in 53% of the patients test results. However, in 51%, no change in the CPK was detected. The interference of drugs on test results is a real problem due to its wide use throughout the population and proves the need for further studies related to possible interferences in clinical exams.Key words: Laboratory tests; biochemical; interference; medicines; dyslipidemia . RESUMOMedicamentos assume importante papel na rotina laboratorial das Análises Clinicas, pela probabilidade de interferir nos ensaios e modificar o diagnóstico clínico-laboratorial. Cabe ao profissional analista clínico responsável detectar essas interferências a fim de evitar diagnósticos equivocados e intervenções clínicas errôneas. O objetivo do trabalho foi avaliar as possíveis interferências do fármaco sinvastatina nos exames laboratoriais bioquímicos. Foi realizado um estudo descritivo retrospectivo, no período de abril a julho de 2015. Foram avaliados os exames laboratoriais realizados pelos pacientes portadores de dislipidemia e usuários de medicamento específico, que utilizaram os serviços prestados pelo Laboratório Municipal de Análises Clínicas de Santo Antônio de Posse (SP). Aos participantes voluntá-rios foi aplicado um questionário para avaliar o estilo de vida e o tempo de uso do medicamento. Foram analisadas as enzimas Fosfatase Alcalina, Creatinofosfoquinase (CPK), Aspartato Aminotransferase (AST) e Alanina lminotransferase (ALT). O estudo mostrou que dos 43 pacientes avaliados, 69,8% apresentaram alterações em pelo menos um dos exames avaliados. Foi observada alteração da enzima ALT em 53% dos pacientes avaliados e nenhuma modificação no valor da CPK em 51% dos sujeitos. As interferências nos resultados de exames causadas por fármacos é um problema real, devido à grande utilização por toda a população, e comprova a necessidade de mais estudos relacionados às possíveis interferências n...
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