Ultrasonic Assessment of Fetal Growth

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Abstract
Consecutive ultrasonic measurement of [human] fetal biparietal diameter and fetal chest area was carried out in 152 normal and 59 complicated pregnancies 25-40 wk of gestation. In normal pregnancy the mean fetal head area varied from 45.0 cm2 at 25 wk to 98.0 cm2 at 40 wk. The mean chest area varied from 31.3 cm2 at 25 wk to 94.3 cm2 at 41 wk. A normal curve of the head-to-chest relation was constructed. In the group of complicated pregnancies, 2 types of fetal growth retardation were recognized. The 1st type was characterized by a normal head-to-chest relationship (symmetric type), the 2nd type was characterized by an abnormal head-to-chest relationship (asymmetric type; relatively large head area). During fetal growth acceleration head-to-chest-relationship was abnormal (relatively large chest area).

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