[The level of alpha-feto protein in amniotic liquor. The antenatal diagnosis of some malformations (author's transl)].

We have measured the levels of alpha-feto protein in 127 samples of amniotic fluid, obtained in the course of antenata diagnosis, using the immunoelectrophoretic method of Laurell. The mean, the upper limit of normal and the extreme levels of alpha-feto protein in liquor have been calculated for each gestational age. The difficulties which have been met with in interpreting the results (false positives and false negatives) have been discussed.