Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

1,679 questions · 1,720 findings · 335 reviews · Headline outcomes only

No studies found 192 · 11.2%GRADE not reported 75 · 4.4%Very low 526 · 30.6%Low 504 · 29.3%Moderate 305 · 17.7%High 118 · 6.9%

Routine/revealed vs selective/concealed ultrasound

Detection of fetal abnormality before 24 weeks' gestation · Fetal ultrasound assessment before 24 weeks' gestation

Routine/revealed probably leads to higher detection of fetal abnormality before 24 weeks' gestation compared with selective/concealed ultrasound (moderate certainty).

1 finding from 1 review

Routine/revealed vs selective/concealed ultrasound

Detection of multiple pregnancy by 24 to 26 weeks' gestation (number NOT detected) · Fetal ultrasound assessment before 24 weeks' gestation

Routine/revealed probably leads to lower detection of multiple pregnancy by 24 to 26 weeks' gestation (number… compared with selective/concealed ultrasound (moderate certainty).

1 finding from 1 review