title: Oral treatment in selective vitamin B12 malabsorption.
abstract: OBJECTIVE
  The efficacy of oral treatment with megadose vitamin B12 in a patient with selective vitamin B12 malabsorption is studied.
  
  
  METHODS
  An 8-year-old boy with megaloblastic anemia due to selective vitamin B12 malabsorption is presented. His history was significant for anemia of 4 years duration, requiring transfusion on two occasions. On admission, the Hb was 7.9 g/dL, WBC 6 x 10(9)/L, mean corpuscular volume 124 fl, red cell distribution width 16.8%, platelets 156 x 10(9)/L, reticulocyte 0.04%, and the serum vitamin B12 level 87 pmol/L. There was proteinuria. Replacement treatment with oral B12 1,000 micrograms/daily was instituted.
  
  
  RESULTS
  Reticulocytosis was observed on the third day of treatment, which was followed by a gradual increase in Hb level to 12 g/dL in 3 weeks. A Schilling test performed after a 5-day interruption of therapy was compatible with malabsorption.
  
  
  CONCLUSIONS
  Our study suggests that the oral route is as effective as the parenteral route when vitamin B12 is given at a dose larger than that of parenteral therapy.
authors.affiliation: Hacettepe University, Faculty of Medicine, Department of Pediatrics, Ankara, Turkey.
authors.forename: C
authors.initials: C
authors.lastname: Altay
authors.forename: M
authors.initials: M
authors.lastname: Cetin
mesh_terms: D000284:Administration, Oral; D000749:Anemia, Megaloblastic / Q000209:etiology; D002648:Child; D006801:Humans; D008286:Malabsorption Syndromes / Q000175:diagnosis / Q000628:therapy*; D008297:Male; D012546:Schilling Test; D014805:Vitamin B 12 / Q000008:administration & dosage* / Q000378:metabolism*
chemical_list: D014805:Vitamin B 12