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Phenylketonuria Definition: Phenylketonuria (PKU) is a genetic disorder that is characterized by an inability of the body to utilize the essential amino acid, phenylalanine.henylketonuria Definition: Phenylketonuria (PKU) is a genetic disorder that is characterized by an inability of the body to utilize the essential amino acid, phenylalanine.
Phenylketonuria (PKU), or phenylalanine hydroxylase (PAH) deficiency, is a lifelong, inborn error of metabolism that causes an amino acid, known as phenylalanine (Phe) to build up in the blood.henylketonuria (PKU), or phenylalanine hydroxylase (PAH) deficiency, is a lifelong, inborn error of metabolism that causes an amino acid, known as phenylalanine (Phe) to build up in the blood.