International audienceStandardization of the measure of disease risk and individualization of patient careThe paradoxical effects of the routine neonatal screening for cystic fibrosisDriven by advances in molecular biology, genetic tests now allow for a focus on early prevention and personalized care for some chronic diseases. Through the analysis of the impact of mass public screening, namely the routine neonatal screening for cystic fibrosis, this article intends to explain the metrological mechanism which underlies its implementation and leads to a “disembodied” clinical condition. Far from negating clinical work, standardization of the measure of disease risk, prior to screening, generates grey areas. We are witnessing the extension of ...