Sensitivity of electrospray-tandem mass spectrometry using the phenylalanine/tyrosine-ratio for differential diagnosis of hyperphenylalaninemia in neonates.


The sensitivity of amino acid analysis by electrospray-tandem mass spectrometry (ESI-TMS) in differential diagnosis of the different forms of hyperphenylalaniemias (HPA) was studied in a total number of 78 dried blood samples from neonates with increased phenylalanine (Phe) concentrations (> 150 micromol/l). Simultaneous quantitative analysis of Phe and… (More)


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