An official website of the United States government
Here's how you know
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Modes of diagnosis and their distributions over five decades from 1971 until 2016. SX, Selective metabolic investigation after onset of symptoms; FH, Family history triggered investigation; NBS, Newborn screening; PT, Prenatal testing.