The goal of this observational study is to evaluate the performance of the PheCheckâ„¢ test for the rapid detection of phenylalanine (Phe) from a fingerstick sample, in patients 1 year or older with phenylketonuria (PKU) or hyperphenylalaninemia. The main objective is comparing the concentration of phenylalanine (Phe) in capillary blood with the reference method (DBS).
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Performance of the PheCheckâ„¢ test for the detection of phenylalanine (Phe) concentration from capillary blood as compared to the reference method (DBS)
Timeframe: Day 1