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biological

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hyperphenylalaninemia

hyperphenylalaninemia Hyperphenylalaninemia is an abnormally high level of phenylalanine in the body, seen in phenylketonuria when activity of the phenylalanine hydroxylase enzyme is reduced.

Hyperphenylalaninemia is an abnormally high level of phenylalanine in the body, seen in phenylketonuria when activity of the phenylalanine hydroxylase enzyme is reduced. In this context, it can disrupt brain development and brain chemical balance, contributing to intellectual and behavioral difficulties if untreated.