title: Accuracy of placental localization by ultrasound.
abstract: In a retrospective study, ultrasound diagnoses were correct in 93% of 164 patients referred for examination because of suspected placenta praevia. There was one false-negative finding in 13 cases of proven placenta praevia, and ten false-positive errors in 151 true-negative cases. False-positive results represented the largest number of errors. Examination of the patient with an empty bladder, in addition to the routine technique, is suggested to reduce the number of false-positive results.
mesh_terms: D003951:Diagnostic Errors; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D010920:Placenta; D010923:Placenta Previa / Q000175:diagnosis; D011247:Pregnancy; D012189:Retrospective Studies; D014463:Ultrasonography; D001743:Urinary Bladder / Q000503:physiopathology