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Discrimination of phenylketonurics from persistent hyperphenylalaninemia patients using a simple phenylalanine
Abstract:
A simple, oral phenylalanine loading test was developed in order to discriminate between controls, phenylketonuria and persistent hyperphenylalaninemia patients. Only three capillary blood specimens for quantitation of phenylalanine and tyrosine over a short duration (90 min) were required. Using stepwise multivariate discriminant analysis, accurate classification was achieved for 27 controls, 12 patients with phenylketonuria and 6 with persistent hyperphenylalaninemia. This loading test and analysis is both simpler and less expensive than those previously described.
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