ORIGINAL ARTICLES   

Minerva Ginecologica 2002 October;54(5):369-72

Copyright © 2002 EDIZIONI MINERVA MEDICA

language: Italian

Early transvaginal sonographic measurement of cephalic index

Rosati P., Guariglia L.

Background. The aim of this study is to obtain normal values of cephalic index by transvaginal scan early in pregnancy.
Methods. In this prospective cross-sectional study, transvaginal high-resolution sonography was performed between 57 and 112 days' gestation in 1087 euploid fetuses. Measurements of cephalic index with standard deviations, calculated as the ratio biparietal diameter/occipito-frontal diameter, were obtained in the single gestational periods considered.
Results. Cephalic index was found to show fairly constant values throughout the period evaluated with smaller values of standard deviation. The best correlation with gestational age was described by a linear correlation.
Conclusions. The data obtained by transvaginal scan can be used as parameters of normal values in early pregnancy.