A little is known about the prevalence of elevated alanine transaminase in a Moroccan healthy population. Our aim was to search for the upper limit of normal alanine transaminase in the blood donors and then to apply the upper limit of normal alanine found in the population so as to assess the prevalence of subjects with abnormal transaminase level. We then, investigated for factors associated with increased level of transaminase in our population. This study was carried out on 14071 blood donors, (74.1% of men and 25.9% female) aged between 18 to 60 years, randomly chosen. Serum transaminase activity was measured using on IEMS Reader, Labsystems. Hepatitis B and C were performed by ELISA. The upper limit of normal transaminase found were 64 for men and 52 for women. Consequently, 2.08% blood donors had an abnormal level of transaminase. Follow up results revealed that drug was the first cause of elevated transaminase in our cohort followed by diet and alcohol consumption. One seroconversion for hepatitis C was identified. In conclusion, this study showed that even though there is an evident lack of efficiency in using alanine aminotransferase testing qualifying blood donors in our country, preventing viral potential transmission through transfusions was possible.
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