Quality of first-trimester measurement of crown-rump length
The crown-rump length (CRLacrnm1) is currently the most reliable measurement for dating pregnancies until 10 weeks ± 4 days of gestation, has a ± 7-day accuracy at 11-14 weeks of gestation, and an inter- and intraobserver error of ± 2 days.1-6 Rel…
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