title: Serum vitamin B12 concentrations within reference values do not exclude functional vitamin B12 deficiency in PKU patients of various ages.
authors.affiliation: Section of Metabolic Diseases, Beatrix Children's Hospital, University Medical Centre of Groningen, University of Groningen, Groningen, The Netherlands.
authors.forename: Inge
authors.initials: I
authors.lastname: Vugteveen
authors.forename: Marieke
authors.initials: M
authors.lastname: Hoeksma
authors.forename: Anne-Lise Bjorke
authors.initials: AL
authors.lastname: Monsen
authors.forename: M Rebecca
authors.initials: MR
authors.lastname: Fokkema
authors.forename: Dirk-Jan
authors.initials: DJ
authors.lastname: Reijngoud
authors.forename: Margreet
authors.initials: M
authors.lastname: van Rijn
authors.forename: Francjan J
authors.initials: FJ
authors.lastname: van Spronsen
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D005260:Female; D006710:Homocysteine / Q000097:blood; D006801:Humans; D007223:Infant; D008297:Male; D008764:Methylmalonic Acid / Q000097:blood; D010661:Phenylketonurias / Q000097:blood / Q000150:complications* / Q000503:physiopathology; D012016:Reference Values; D012189:Retrospective Studies; D014805:Vitamin B 12 / Q000097:blood*; D014806:Vitamin B 12 Deficiency / Q000097:blood / Q000175:diagnosis / Q000209:etiology*; D055815:Young Adult
chemical_list: D006710:Homocysteine; D008764:Methylmalonic Acid; D014805:Vitamin B 12