The routine NBS is accurate for detection of galactosemia. Two screening tests are used to screen infants affected with galactosemia—the Beutler's test and the Hill test.[8] The Beutler's test screens for galactosemia by detecting the level of enzyme of the infant. Therefore, the ingestion of formula or breast milk does not affect the outcome of this part of the NBS, and the NBS is accurate for detecting galactosemia prior to any ingestion of galactose.