Ultrasound screening in pregnancy: a systematic review of the clinical effectiveness, cost-effectiveness and women's views.

Specific interventions included in the review Studies of routine ultrasound screening during the first, second, or third trimester of pregnancy for the detection of foetal abnormalities were eligible for inclusion. The studies were required to fully describe the ultrasound intervention and the definition of anomalies sought. The description of the intervention should include gestation at the time of ultrasound, diagnostic approach, quality control, operator(s), and skills, and equipment used. In the included studies, ultrasound was mainly performed by radiographers, sonographers, or obstetricians in district general hospitals or tertiary care centres.