Helpline: 0845 077 2290 or 0207 713 7486 via mobile

Helpline: 0207 713 7486

Timing

Timing of tests

Early ultrasound scans

  • Fetal viability scan: 6 – 10 weeks
  • Dating scan:  9 – 14 weeks

Screening tests

  • Sickle cell & thalassaemia blood test:  Ideally before 10 weeks
  • Infectious diseases blood test:  8 – 12 weeks

Down’s syndrome screening

Combined test

  • Nuchal translucency (NT) scan: 11 – 14 weeks + 1 day

Integrated test

  • Combined test: 11 – 14 weeks + 1 day with Quadruple test: 16 – 20 weeks (four pregnancy hormone levels are measured)

NB: The result of the integrated test is given after the second blood test.

Quadruple (Quad) test

  • Quadruple test: 14 weeks +2 days  – 20 weeks + 0 days (four pregnancy hormone levels are measured)

Fetal anomaly scan

  • Detailed ultrasound scan: 18 – 20 weeks + 6 days

Invasive diagnostic tests

  • Chorionic villus sampling (CVS): 11 – 14 weeks
  • Amniocentesis: 16 – 22 weeks (can be performed later).

ARC's national helpline

Want to talk? We’re here as often as you need us. Our helpline is answered by trained staff Monday to Friday, 10.00am-5.30pm; call 0845 077 2290 or 0207 713 7486 from a mobile.