DQASS
is a statistical support service for NHS Down's syndrome, Edwards’ syndrome and Patau’s syndrome screening laboratories nationwide, and is part of the . The overall aim is to monitor and support the quality and effectiveness of prenatal screening in England to ensure all pregnant women have access to a screening programme that is uniform, equitable and adheres to national guidance.
We have held the contract for DQASS at the ²ÝùÊÓÆµ since its inception in 2006. Annually we analyse approximately 500,000 records from 22 laboratories/laboratory networks and around 200 ultrasound units covering almost 3,000 individual sonographers.
We provide an independent audit of laboratory and ultrasound nuchal translucency data in a standardised and statistically valid way. The statistical analyses monitor the screening process at various levels; from the overall standardised screen positive rate at the top level all the way through to specific adjustments for ethnicity, smoking and other factors applied to individual biomarkers.