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 with Blood test: 11 – 14 weeks 1 day (two pregnancy hormone levels are measured)
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: 16 – 20 weeks (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)