In two years, they had tested 400,000 American newborns, and diagnosed 39 with PKU. This early diagnosis allowed for early treatment and avoidance of the most severe consequences of the disease. Throughout the 1960s, PKU testing expanded in the United States and around the world, eventually becoming required by law in many jurisdictions.
Over two years, they conducted tests on 400,000 American newborns, identifying 39 cases of PKU. This early diagnosis enabled prompt treatment and prevented severe complications from the disease. During the 1960s, PKU testing became widespread in the United States and globally, eventually becoming mandatory in many areas.