In the UK, we may be able to access source DNA from the Guthrie cards retained by the National Health Service. These contain small blood samples taken from almost every baby born in the UK since the 1950s, obtained by a pinprick test on the heel, blotted on to paper and used to test for a variety of genetic conditions including sickle-cell disease, phenylketonuria, hypothyroidism and cystic fibrosis.
