Screening for inherited metabolic disease by plasma chromatography (Scriver) in a large city.

Before introducing a more comprehensive screen such as plasma chromatography, with its potential to detect 20 amino-acid disorders-an advantage over screening methods which detect only phenylketonuria-the greatly increased problems of organization and the effect on the community, midwives, paediatric services, and laboratory should be considered. The three years' experience in Birmingham showed a three-fold increase in cases detected and suggests criteria for further investigation and treatment.