Newborn screening has revolutionized the early diagnosis of genetic conditions and enabled early therapeutic interventions, which have dramatically improved the outcomes for numerous disorders. The advent of tandem mass spectrometry in the 1990s opened the possibility of cost-effective multiplex screening for a multitude of disorders on the same sample. In the early 2000s, as it still is now, newborn screening was a state-based program, with some states screening for only 4 disorders while others screened for more than 30. This geographical variability prompted the US federal government to task the American College of Medical Genetics to develop national guidelines, including a uniform condition panel. The Advisory Committee on Heritable Disorders in Newborns and Children (ACHDNC) was created as a part of this mission and worked to review current evidence to create the Recommended Universal Screening Panel (RUSP). In the original report, 29 conditions were identified based on a scoring system as primary targets for screening (core panel) with an additional 25 conditions that could be identified while screening for the core panel conditions. Familial hypercholesterolemia (FH) was considered but not recommended as a part of the original core panel. Several other disorders that originally scored lower than FH, including mucopolysaccharidosis type I and Pompe disease, among others, have since been added to the RUSP as new treatments have become available, and there are currently 37 core conditions that are formally recommended on the RUSP.