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[Early transvaginal sonographic measurement of cephalic index]
1Istituto di Clinica Ostetrica e Ginecologica, Università Cattolica del Sacro Cuore, Rome, Italy.
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.