In this paper

the authors have reported AFP level in the blood serum of 2223 normal pregnant women in different semesters by RIA method. All the data were made by statistical analysis. The result has shown that the AFP level was normal during the first 12 weeks of pregnancy. Then

it gradually increases from the 13th week and reaches its maximum（184.6±74.6 μ g/l） at 32nd week. Later on it tends to decrease slowly

but still remains over 100 μg/l in parturient period. Therefore

it was suggested that AFP in pregnant women have substantial difference and regularity between different semesters but without any significant correlation with their ages.