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Epidemiologia clínica - testes de avaliação das enzimas hepáticas
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Introdução
A literatura disponível sobre sensibilidade, especificidade e valores preditivos dos testes de avaliação das enzimas hepáticas é bastante limitada. Foi relatado um intervalo de sensibilidade de 45 a 100% no teste da actividade da alanina amino-transferase (ALT) canina, consoante a patologia hepática (hepatopatia aguda ou crónica, etc.) (1). Neste trabalho, o valor preditivo citado para a prova da ALT foi de 18%, isto é, a elevação do nível de actividade da ALT foi considerada indicativa de doença hepática em 1 de 5 pacientes. A especificidade da fosfatase alcalina (FAS) canina varia entre 44 e 90% consoante a doença hepática em causa, com um valor preditivo de 21%, sensivelmente idêntico ao do teste da actividade da ALT. Geralmente, estes testes não são suficientes para estabelecer um diagnóstico definitivo, pelo que é essencial a monitorização do paciente através de exames mais específicos. No presente artigo, descrevem-se os resultados dos testes de avaliação das enzimas hepáticas, constantes na base de dados Banfield, de animais de companhia considerados saudáveis. [...]
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