Who is and isn't having babies with Down syndrome in western Sydney: a ten year hospital cohort study.

Background: Screening for Down syndrome (DS) is a key component of antenatal care, recommended to be universally offered to women irrespective of age or background. Despite this, the diagnosis of DS is often not made until the neonatal period.

Aims: To retrospectively describe and compare the differences in populations with an antenatal diagnosis (AD) and neonatal diagnosis (ND) of DS and to explore why an antenatal diagnosis was not made.