Early Pregnancy Ultrasound

Neilson JP.
Ultrasound for fetal assessment in early pregnancy (Cochrane Review).
In: The Cochrane Library, Issue 4, 2001. Oxford: Update Software, Abstract.

A review of 9 trials of women scanned routinely in early pregnancy (usually before 20 weeks) compared to those with scans for specific indications. Those scanned routinely had better detection of gestational age, earlier detection of clinically unsuspected fetal malformations and earlier detection of multiple pregnancy. The odds ratio of undiagnosed twins in the routinely scanned group at 26 weeks was 0.08 (95% CI 0.04-0.16).

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