Hyperphenylalaninemia due to classic phenylketonuria (PKU)is accompanied by all the following except:

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Hyperphenylalaninemia in classic PKU is characterized by elevated blood phenylalanine levels, increased urinary phenylketones, and can lead to mental retardation if untreated. However, it does not cause an elevation of blood tyrosine; instead, tyrosine becomes an essential amino acid due to the inability to convert phenylalanine to tyrosine.

Hyperphenylalaninemia Due to Classic Phenylketonuria (PKU)is Accompanied by All the Following