%0 Journal Article %T The neonatal tetrahydrobiopterin loading test in phenylketonuria: what is the predictive value? %A Annet M. Bosch %A Carolien C.A. Boelen %A Floris C. Hofstede %A Francjan J. van Spronsen %A Karen Anjema %A M. Estela Rubio¨CGozalbo %A Maaike C. de Vries %A Margreet van Rijn %J Archive of "Orphanet Journal of Rare Diseases". %D 2016 %R 10.1186/s13023-016-0394-2 %X It is unknown whether the neonatal tetrahydrobiopterin (BH4) loading test is adequate to diagnose long-term BH4 responsiveness in PKU. Therefore we compared the predictive value of the neonatal (test I) versus the 48-h BH4 loading test (test II) and long-term BH4 responsiveness %K Phenylketonuria %K PKU %K Tetrahydrobiopterin %K BH4 %K Neonate %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4731980/