Dating scan pregnancy
This detailed ultrasound scan, sometimes called the mid-pregnancy or 20-week scan, is usually carried out when you are between 18 and 21 weeks pregnant.
In some areas it may be carried out later than 21 weeks.
The anomaly scan is offered to everybody, but you do not have to have it if you do not want to. You will be asked to give your permission for it to be carried out.
Make sure you understand what is going to happen, and feel free to ask any questions.
The anomaly scan is carried out in the same way as the dating scan, with gel on your tummy and the sonographer passing the ultrasound device backwards and forwards over your skin.The gel makes sure there is good contact between the probe and your skin.A black and white image of the baby will appear on the ultrasound screen.This does not mean there is anything to worry about.You may need to have a full bladder when you come for the appointment. The mid-pregnancy scan can sometimes find problems with the baby.