The discriminatory human chorionic gonadotropin zone for endovaginal sonography: a prospective, randomized study.


OBJECTIVE To determine the probability of detecting the gestational sac of a normal intrauterine pregnancy by vaginal ultrasound at different gestational ages and serum hCG concentrations. DESIGN Prospective, randomized study. SETTING Pregnant human volunteers in a university-based clinical research environment. PATIENTS Women with viable pregnancies… (More)


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