makes it possible to reduce the risk that it will be incorrectly considered prolonged and that labor will therefore be induced unnecessarily (grade A). For spontaneous conceptions, it is routinely recommended to use crown-rump length (CRL) measurement before 14 weeks to determine the date pregnancy began and to calculate gestational age (grade C). Ideally, this measurement should be taken between 11+0 and 13+6 weeks (when CRL should measure from 45 to
84 mm).