Week 18 of pregnancy: Preparing Questions for the Anatomy Scan

At eighteen weeks, an anatomy scan may be approaching. It is often called the 20 week scan, but it is usually scheduled within a window rather than on one exact date. Knowing its purpose and how to prepare can leave more room for your questions during the appointment.

Development around this stage

Swallowing and sucking reflexes continue to develop, and your baby moves the arms and legs. You may also be noticing changes in your breasts, abdomen or balance. Weekly descriptions cannot establish what your own scan must show, so use the appointment to ask about your individual findings.

Understand what the scan offers

In England, the routine screening window is 18 weeks to 20 weeks and 6 days. The scan looks for signs of specific physical conditions and checks growth. It also provides information about the placenta. It cannot identify every possible condition or guarantee future health.

Our anatomy scan guide explains what the examination involves. Having the scan is your choice. If you are unsure about the information it might provide, ask for a discussion before deciding.

Check the practical details

Read the appointment instructions about bladder preparation, clothing and bringing your maternity notes. Check the clinic’s policy about companions and children. If you need an interpreter, accessible facilities or extra support during an examination, request this ahead of time.

Tell the sonographer if you do not want to know the baby’s sex. Identifying sex is not the screening programme’s purpose, and a view that allows it is not guaranteed.

You could prepare three questions: Was the examination complete? Were any findings unexpected? Does anything need another appointment? Write them somewhere you can easily reach after the scan.

Clarify why another scan is offered

Sometimes the baby’s position or image quality prevents every view from being obtained. Another appointment may be offered to complete the examination. This is different from a referral because a possible condition was seen.

The repeat ultrasound guide explains the importance of asking what remains unclear. If there is a suspected finding, the team should explain the specialist assessment or further tests offered. Ask for the plan in writing and a contact number for questions afterwards.

Keep the next step separate from other people’s scan stories. The relevant information is what was assessed in your appointment, what remains uncertain and who will help you understand the result.