ABSTRACT
Serial ultrasound measurements of the fetus under investigation is an important indicator
of fetal growth, and thus fetal health. To assess how reliable those measurements
are, a videotape was made, and, utilizing an ultrasound machine that allowed the placement
of callipers on the videotape, the dispersion of the measurements obtained by 17 sonographers
was noted. In the individual fetus in the third trimester of pregnancy, a 95% confidence
interval of 3.5 and 2 weeks was found, respectively, for the measurements of the abdominal
circumference and biparietal diameter (inter- and intraobserver variation combined).
