Expanding newborn screening: process, policy, and priorities.

In the 1960s, newborn screening programs tested for a single very rare but serious disorder. In recent years, thanks to the development of new screening technology, they have expanded into panels of tests; a federally sponsored expert group has recommended that states test for twenty-nine core disorders and twenty-five secondary disorders. By the standards used to decide whether to introduce new preventive health services into clinical use, the decision-making in newborn screening policy has been lax.