When is amniocentesis recommended for Down syndrome?

Screening tests estimate the chance of Down syndrome; they do not confirm it. Amniocentesis is a diagnostic procedure in which a clinician uses ultrasound guidance to collect a small sample of amniotic fluid. The fluid contains fetal cells that can be tested for chromosome changes, including the extra chromosome associated with trisomy 21. The result can provide clearer information, but the procedure has potential pregnancy risks that should be explained before consent.

Discuss the reason for testing, the timing offered by your maternity team, what the laboratory can examine, and how quickly results may be available. Ask what a positive, negative, or uncertain result would mean for your pregnancy care. Tell the team about your blood group, medicines, bleeding problems, and any previous pregnancy concerns. Read about the procedure and consider genetic counselling so the decision matches your values.

Contact your maternity unit urgently after amniocentesis if you have leaking fluid, heavy bleeding, fever, worsening abdominal pain, regular contractions, or feel acutely unwell. Follow the team’s instructions about activity and monitoring. Do not wait for the test result if new concerning symptoms develop.

Ask what prompted the offer, what alternatives are available, and what information each option can provide. Discuss procedure risks, result timing, follow-up arrangements, and who will support you in understanding the report.