Table 1.  Screening methods for Down's syndrome and local scanning policies District Serum screening Nuchal thickening Dating scan Anomaly scan Maternal age* A Yes No 16 wks No No B Yes No 12 wks Yes No C No Yes (for 34 years) No Yes Yes D No Yes No Yes Yes E Offered privately Offered privately No Yes Yes F No No No Yes Yes G No No No Yes Yes H No No No Yes Yes (for 37 years) * Offered at 35 years unless specified.