Anatomical Sonar

An anatomical sonar (also called an anomaly scan or detailed fetal anatomy ultrasound) is a comprehensive ultrasound done around 18–22 weeks of pregnancy to check how your baby is developing physically.

When Is the Anatomical Sonar Done? Between 18 and 22 weeks of pregnancy

• Most commonly done at 20 weeks
• Can be earlier if necessary, especially in high-risk pregnancies

Why Is It Done? The purpose of the anatomical sonar is to check the structure and development of your baby in detail. It’s one of the most important scans of your pregnancy. It looks for: ✅ Physical abnormalities or birth defects ✅ Organ development (brain, heart, kidneys, stomach, bladder) ✅ Spine and limb formation ✅ Face and skull structure (including cleft lip) ✅ Placenta position (to rule out placenta previa) ✅ Amniotic fluid levels ✅ Umbilical cord (number of vessels) ✅ Baby’s size and growth pattern ✅ Sex of the baby (if you wish to know)

What Happens During the Scan?

• It’s a non-invasive ultrasound done on your belly
• The sonographer will take multiple measurements and images
• The scan usually lasts 30–45 minutes
• You may be asked to come with a full bladder to help visibility

What If They Find Something? If the scan shows any concern:

• You may be referred for further testing (e.g. a high-resolution scan, genetic counselling, or amniocentesis)
• Many minor findings resolve naturally or are non-serious
• It helps with early diagnosis and birth planning if needed