On the recommendation of the United Kingdom National Screening Committee (UK NSC), a newborn cystic fibrosis screening programme was introduced in England in 2001 to identify babies with cystic fibrosis. The screening programme is not designed to test for cystic fibrosis carrier status. A small proportion of babies (about one in 100) are unavoidably identified during the testing as cystic fibrosis carriers. This can happen if a mutation analysis of a blood sample is required after the biochemical test. In such cases, in line with other newborn screening programmes, parents will be advised that their child is a carrier. The UK NSC keeps all its policy advice under review.