
Keywords: Phe، فنیل آلانین; PKU, phenylketonuria; pah, phenylalanine hydroxylase; phe, phenylalanine; AAA, amino acid analyzer; MS/MS, tandem mass spectrometry; IEC, ion-exchange chromatography; tyr, tyrosine; DBS, dried blood spotBland–Altman; Amino acid analyzer; Phenylalanine ana