How to date pregnancy?

Accurate gestational assessment is essential for adequate growth assessment, appropriate aneuploidy screening and correct management of term. Based on expert opinion and beside ART pregnancies, it is recommended to use crown-rump length (CRL) to determine date of conception whenever there is an appropriate measurement taken at 11-14 weeks. This allows accurate dating at approximately 5 days in 95% of cases. (C) 2011 Published by Elsevier Masson SAS.