We evaluated the use of extended field-of-view (EFOV) ultrasound imaging in obstetrics and the possible advantages and applications. From July 2000 to May 2001, 57 randomly selected pregnancies and two woman postdelivery referred for routine and targeted ultrasound examination were studied by conventional B-mode and EFOV ultrasound. We subjectively compared conventional B-mode and EFOV by judging the general visualization as perceived by the operator and by the referring doctor. EFOV imaging provides better visualization of structures too large for a conventional sector image by creating one image of the entire structure and showing the relationship to or within the uterus. The EFOV images were easier to interpret by the referring or another nonexamining doctor. Fetal movements interfere with EFOV imaging, but not with the surrounding organs. A list of obstetrical applications for the use of EFOV is proposed. The use of EFOV imaging appears to be a reliable method to visualize the uterus in its entirety as well as genital tract tumors, the placental implantation and fetal structures throughout pregnancy. EFOV imaging of the fetus is limited by fetal movements.