PFM.69 Customised vs uncustomised ultrasound charts in the assessment of perinatal mortality risk in the South Asian maternity population

Background Small for gestational age (SGA) birthweight has an increased association with perinatal mortality when defined by a customised instead of a population based standard.1 We wanted to examine whether this applies also to ultrasound estimated fetal weight (EFW) in a South Asian cohort. Method The data were extracted from an NHS regional database of singleton, normally formed pregnancies collected between 2009–2012. Of a total of 141,731 pregnancies, 18,400 (13.0%) were of South Asian mothers (Indian, Pakistani or Bangladeshi). In pregnancies with more than one growth scan, the last scan was used for analysis. SGA (