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Objective To study the pregnant womens expectation and understanding about the ultrasound examination in the first and second trimester.Method Specially designed questionnaires were used to assess their expectation and understanding about the ultrasound examination in the first and second trimester in 284 pairs of pregnant women.Results Respondents to the first trimester and second trimester survey varied.65.9% of pregnant women thought fetal morphology abnormalities can be detected in the first trimester ultrasound examination.