Your choice will be respected if you decide not to have the scans, and your antenatal care will continue as normal. First- vs second-trimester ultrasound: To check the growth of the baby it is necessary to do two scans a couple of weeks or more apart. The methods were tested for mean differences compared to different methods to take account for the normal variation of the pregnancy length. We identified all pregnancies in which the CRL was measured to be between 45—84 mm, which is the interval used as the standard criterion for pregnancy dating according to the Fetal Medicine Foundation criterion. B BusyBeeMommy. Media last reviewed:
In December Babies Due date change?
Dating scan put my due date back 2 weeks!!
Read on for more information about what a dating scan offers. The information is not a substitute for independent professional advice and should not be used as an alternative to professional health care. Oldest Newest 21 Posts. During your pregnancy, you will be offered a number of tests and scans. Ha ha! If the scan is after 10 weeks, ultrasound recordings are usually made through your abdomen. Appropriately performed obstetric ultrasonography has been shown to accurately determine fetal gestational age 1.