How accurate are dating scans in pregnancy
Most scans are carried out by specially trained staff called sonographers.
The scans are completely painless, have no known side effects on mothers or babies, and can be carried out at any stage of pregnancy.The sonographer estimates when your baby is due (the estimated date of delivery, or EDD) based on the baby's measurements.The dating scan can include a nuchal translucency (NT) scan, which is part of the combined screening test for Down's syndrome.Talk to your midwife, GP or obstetrician about any concerns you have.For many women, ultrasound scans are the highlight of pregnancy.For example, you may be offered further tests that have a risk of miscarriage.
Hospitals offer all pregnant women at least two ultrasound scans during their pregnancy: The first scan is sometimes called the dating scan.
The sonographer will be able to tell you the results of the scan at the time. Some people want to find out if their baby has problems, while others don't.
The dating scan and anomaly scan are offered to all women, but you don't have to accept them.
You may like someone to come with you to the scan appointment.
Most hospitals do not allow children to attend scans as childcare is not usually available.
See What if a screening test shows a possible problem?