Anatomy scans: What the Detailed Examination Looks For

The anatomy scan is a detailed ultrasound examination of your baby’s body. It is often called the anomaly scan or the 20 week scan. Its purpose is to look for particular physical conditions and assess development, rather than simply provide a picture or reveal the baby’s sex.

What the examination looks at

In England, the screening programme usually schedules this scan between 18 weeks and 20 weeks plus 6 days. It checks for signs of 11 specified conditions by examining structures such as the brain, spine, face, heart, kidneys, abdomen and bones. The team also assesses growth and the placenta.

The scan cannot identify every condition. Some findings are easier to see than others, and a reassuring examination cannot guarantee every aspect of a baby’s future health. Ask what was assessed if a report uses unfamiliar abbreviations.

Prepare for a clinical appointment

Follow the clinic’s instructions about bladder preparation and bring your maternity record if it is on paper. Wear clothing that makes your abdomen easy to access. Check the visitor policy before arranging for someone to join you, especially if you need childcare.

The examination commonly takes about half an hour, sometimes longer. The sonographer may need to concentrate quietly while taking measurements. You can ask when they will explain the findings rather than trying to interpret a pause or a facial expression.

Our first ultrasound guide explains the general appointment experience. Tell staff if the examination is uncomfortable so they can help you adjust.

Incomplete views and unexpected findings differ

Sometimes the baby’s position prevents the team from completing all the required views. You may be offered another appointment to finish the examination. This does not, by itself, mean that a condition has been found.

An unexpected finding may instead lead to a specialist assessment, additional imaging or an offer of diagnostic testing. Ask which of these situations applies to you. The repeat ultrasound guide explains the importance of understanding the reason for another appointment.

Ask for an explanation of the result

Before leaving, ask whether the examination was complete, whether anything needs checking again and who will arrange it. If a possible condition is identified, request an explanation of what is known now and what further tests could clarify.

You can discuss whether to accept further testing and what each choice means for care. The unexpected prenatal results guide provides questions for that conversation. Keep the report and next appointment details together, so you do not have to reconstruct the plan from memory later.