Accordion Sample DescriptionNuchal translucency is an Ultrasound Scan performed between weeks 11 and 14. This Ultrasound Scan is used to determine if your baby is affected by genetic abnormalities such as Down’s syndrome (T21), Edward’s syndrome (T18), or Patau’s syndrome (T13). This is done by measuring the length of your baby (CRL), a fluid pocket on the back of your baby’s neck (all babies have this at this stage of pregnancy), and a blood test from your arm. The blood test will examine two hormones (Betta HCG and PAPPA ). Once we have all the information, the laboratory will be able to calculate an estimation of the chance of this baby being affected by one of these three chromosomal abnormalities. We will also need some information about you as the mother.