Dating of pregnancy
The second scan offered to all pregnant women is called the anomaly scan, or mid-pregnancy scan, and usually takes place between 18 and 21 weeks of pregnancy.
This scan checks for structural abnormalities (anomalies) in the baby.
This is because most babies are healthy and do not have abnormalities. If a problem is found or suspected, the sonographer may ask for a second opinion from another member of staff.
You might be offered another test to find out for certain if there is a problem.
A black and white picture of the baby will appear on the ultrasound screen.
During the examination, sonographers need to keep the screen in a position that gives them a good view of the baby.
You'll be given the chance to discuss it with your maternity team before making your decision. You may like someone to come with you to the scan appointment.
You'll be able to discuss this with your midwife or consultant.Ultrasound scans use sound waves to build a picture of the baby in the womb.The scans are painless, have no known side effects on mothers or babies, and can be carried out at any stage of pregnancy.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, such as amniocentesis, that have a risk of miscarriage.The first scan is sometimes called the dating scan.The sonographer will carefully examine your baby's body.