Definition: The presence of abnormally high blood levels of phenylalanine, which may be associated with elevated tyrosine levels, in newborn infants (premature and full-term), associated with the heterozygous state of phenylketonuria, maternal phenylketonuria, or transient deficiency of phenylalanine hydroxylase or p-hydroxyphenylpyruvic acid oxidase.
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Examples: glitazone, GI cocktail, etc.