how accurate are dating scans
Dating scans are the most accurate way of predicting your due date. The whole point of the scan is to work out how many weeks pregnant you are. You may have calculated the length of your pregnancy from the first day of your last menstrual period (LMP).he scan will usually show that your pregnancy is less far along than suggested by your LMP. This means that accurate dating reduces your chance of having your labour induced because your baby is thought to be overdue (LeFevre et al 1993, NICE 2008) .