title: First-trimester fetal biometry using transvaginal sonography.
abstract: First-trimester fetal biometry using transvaginal sonography is now feasible and desirable due to improved imaging and probe maneuverability. A study of 144 early normal pregnancies with precise dates is presented. Regression models were constructed for the crown-rump length, biparietal diameter, head circumference and abdominal circumference. Error analysis of the technique and calculations was performed. First-trimester fetal biometry may be used for obtaining precise estimates of gestational age and may help to detect early fetal maldevelopment resulting in abnormal growth.
authors.affiliation: Columbia University College of Physicians and Surgeons, Department of Obstetrics and Gynecology, New York 10032, USA.
authors.forename: D M
authors.initials: DM
authors.lastname: Lasser
authors.forename: D B
authors.initials: DB
authors.lastname: Peisner
authors.forename: J
authors.initials: J
authors.lastname: Vollebergh
authors.forename: I
authors.initials: I
authors.lastname: Timor-Tritsch