Everything You Need to Know About the 20-Week Anomaly Scan

If you are pregnant and approaching your 18th week, you've probably heard about the anomaly scan — also called the mid-pregnancy scan or the 20-week scan. This comprehensive ultrasound examination is one of the most important investigations during pregnancy, and understanding it can help reduce anxiety and help you make informed decisions.

What is the Anomaly Scan?

The anomaly scan is a detailed ultrasound performed between 18 and 22 weeks of pregnancy. It uses high-frequency sound waves to create detailed images of your baby, allowing doctors to check that the baby is developing normally and to identify any structural abnormalities.

What Does It Check?

• Brain structure — including the skull, cerebellum, and ventricles
• Heart — chambers, valves, and outflow tracts
• Spine — vertebrae and spinal cord integrity
• Abdominal organs — kidneys, bowel, and stomach
• Face — lips and palate (to detect cleft lip)
• Limbs — arms, legs, hands, and feet
• Placental position and amniotic fluid levels
• Fetal growth and estimated weight

What if Something is Found?

If a potential abnormality is detected, your doctor will discuss the findings carefully. In many cases, what appears unusual on a scan turns out to be a normal variant. For genuine concerns, further investigations such as amniocentesis, NIPT, or fetal echocardiography may be recommended.

Early detection through the anomaly scan allows parents and medical teams to prepare appropriately — whether that involves additional monitoring, specialist consultations, or, in some cases, fetal therapy.

Preparing for the Scan

• Drink plenty of water before the scan — a full bladder helps
• Wear loose, comfortable clothing
• Bring your previous scan reports and maternity card
• Come with your partner or a support person if possible

Book Your Anomaly Scan Today

At The Fetal Medicine Clinic, Begusarai, our anomaly scans are performed on state-of-the-art ultrasound machines by experienced fetal medicine specialists with specialized training in prenatal diagnosis.