What should you know about neural tube defect screening?

Screening may include a review of pregnancy dates and medical history, a maternal blood test where available, and ultrasound. The anomaly scan checks fetal anatomy, including the developing brain and spine. Results can be described as lower or higher likelihood rather than certain or absent.

Screening has limits: fetal position, gestational age, image quality, and the type of defect can affect what is seen. A higher-likelihood result needs diagnostic discussion, not a conclusion about the baby’s health.

Ask the maternity team to explain exactly which test produced the result and what it can detect. Attend the recommended anomaly scan or repeat scan, and ask whether a maternal-fetal medicine referral is appropriate. For a future pregnancy, preconception care can review personal history, medicines, health conditions, and folic acid advice.

Keep copies of reports and note the gestational age used for each test. Do not make decisions from a screening label alone; discuss the result with a clinician who can interpret it in context.

Contact your maternity team when you receive a higher-likelihood result or are told that the scan was incomplete, so the next assessment can be arranged. Seek urgent pregnancy care for severe pain, heavy bleeding, fluid loss, fever, or feeling seriously unwell.

Ask what the screening result measures, whether it is a screening or diagnostic test, what could make the result less clear, which follow-up scan or specialist is needed, and when you should expect an explanation.