Classical Phenylketonuria; Deficiency Disease, Phenylalanine Hydroxylase; Folling Disease; Phenylalanine Hydroxylase Def... 


Phenylketonuria (PKU) is a human genetic disorder that occurs in about 1 in 15,000 births, but the incidence varies widely in different human populations from 1 in 4,500 births among the Irish to fewer than one in 100,000 births among the population of Finland.

Phenylketonuria as related to Brain and Nervous System