Valores normales de las alfa-fetoproteínas en embarazadas a las 24 y 28 semanas de gestación

objective: to obtain the normal values of α-fetoprotein, between 24-28 weeks of pregnancy, to be use as levels of reference in the pregnancies with preterm delivery risk. method: longitudinal prospective study, non experimental, in 80 pregnant women attended between january to november 2005. alfa-fetoprotein was determined by the elisa technic. results: the α-fetoprotein mean values oscilated between 112 ng/ml at 24 weeks and 133 ng/ml at 28 weeks, and in the percentile distribution with ranges of 60 ng/ml in the percentile 10 and 200 ng/ml in the percentile 90 at the 24 weeks. at 28 weeks the range were 82 ng/ml in the percentile 10 and 230 ng/ml in the 90 percentile. conclusions: we have at one？s disposal α-fetoprotein values as a parameter to be used as pronostique in the high risk pregnancy of preterm delivery.