[Alpha-fetoprotein in assessing obstetric diagnosis (author's transl)].

Radio-immunologic measurement of alpha-fetoprotein is possible in small amounts of blood and amniotic fluid. During the first half of pregnancy the AFP values in maternal serum are lowered when there is fetal abnormality (hydatid cyst, immnent abortion). In the second half of pregnancy high values of AFP also indicate danger to the fetus (Rh-incompatibility). The older the pregnancy the AFP values in amniotic fluid fall. In pathologic pregnancy (hydramnion, anencephaly, trisomy) AFP concentration was normal or raised. Measurement of the AFP level in umbilical cord -- blood provides further diagnostic chances: assessment of the duration of pregnancy and, therefore, of fetal maturity.