- Double marker test (PAPP-A + free beta hCG)/ Enhanced First Trimester Screening (PAPP-A + free beta hCG+ PLGF) – Performed between 11- 13 weeks as part of Combined first trimester screening
- Quadruple screening (16-18 weeks) – Four chemicals are measured: alpha-feto protein, unconjugated estriol, free beta hCG and dimeric inhibin A. These results are combined with your age, weight and gestation to give an estimate of the chance that a pregnancy/baby has a chromosome condition