Month of delivery | Chorionic villus biopsy in pregnancy |
Congenital abnormality suspected in pregnancy | Amniocentesis in pregnancy |
Actual congenital abnormality | Interpreter required |
Booking appointment after 20 weeks gestation | Previous terminations |
Mother’s Carstairs quintile [25] (a measure of deprivation) | Previous miscarriages |
Maternal skeletal condition (eg previous fractured pelvis, spinal abnormality) | Fibroids |
Borderline maternal hypertension (BP 140 systolic or 90 diastolic) | Maternal inflammatory bowel disorder |
Mother’s smoking status |