[Fetal growth assessment by the real-time ultrasono-tomography (author's transl)].

This paper is concerned with the methods and results of fetal growth assessment by using the real-time ultrasono-tomography under our newly systematized flow of the fetal management. The following results were obtained. 1) At early stage of pregnancy gestational age of the fetus may be corrected more precisely with the measurement of fetal crown-rump length (CRL) than diameter of amniotic space. 2) The correlation coefficient between gestational days by BBT base and CRL was 0.990 and standard deviation was +/- 2.3 mm. The error of estimated gestational days was +/- 3 days. 3) With one parameter such as the biparietal diameter (BPD), or the fetal abdominal circumference (FAC), it seems to be difficult to find out abnormal fetal growth from the normal growth at the last stage of pregnancy. 4) The discriminant function [Z = 0.6012 X (BPD) + 3 . 100 X (FAC) - 45.204] was obtained within seven days of delivery in order to find immature and mature neonates. With this equation, the probability for correct diagnosis was 90.4%, and 9 in 10 cases of IUGR were predicted. 5) Using four parameters (BPD, FAC, Gestational age, Uterine length), the predicted birth weights was computed. The correlation coefficient between the predicted birth weights and the actual birth weights was 0.852 and 1 S.D. was +/- 281 gram.