title: Thrombocytopenia in children with severe iron deficiency.
abstract: OBJECTIVE
  Thrombocytopenia has been reported in some children with severe iron deficiency anemia, but the validity of the association and the mechanism of the thrombocytopenia are not well established. Six children with severe iron deficiency and thrombocytopenia are described, and the literature is reviewed.
  
  
  METHODS
  Clinical, hematologic, and morphologic data were collected and analyzed for six patients referred for evaluation of severe microcytic anemia and thrombocytopenia.
  
  
  RESULTS
  The children ranged in age from 14 months to 17 years (median age 27 months) and were otherwise healthy. The iron deficiency was nutritional in four patients younger than 3 years of age and resulted from menstrual blood loss in two teenage girls. The mean initial hemoglobin was 2.5 g/dL (range 1.6-4.7) and the mean initial platelet count was 64 x 109/L (range 11-102). Bone marrow examinations were performed in three patients and showed increased numbers of megakaryocytes. After treatment with therapeutic doses of oral iron, all the patients showed rapid increases in their platelet counts.
  
  
  CONCLUSIONS
  These observations validate and extend previous reports of an association between severe iron deficiency and thrombocytopenia. The increased numbers of megakaryocytes and the extremely rapid increase in platelet counts after initiation of iron therapy suggest an essential role for iron in a late stage of thrombopoiesis.
authors.affiliation: Department of Pediatrics, The Pritzker School of Medicine, the University of Chicago, Illinois 60637, USA.
authors.forename: Meryl K
authors.initials: MK
authors.lastname: Perlman
authors.forename: Joel G
authors.initials: JG
authors.lastname: Schwab
authors.forename: James B
authors.initials: JB
authors.lastname: Nachman
authors.forename: Charles M
authors.initials: CM
authors.lastname: Rubin
mesh_terms: D000284:Administration, Oral; D000293:Adolescent; D018798:Anemia, Iron-Deficiency / Q000150:complications* / Q000503:physiopathology / Q000628:therapy; D001772:Blood Cell Count; D001792:Blood Platelets; D001854:Bone Marrow Cells / Q000473:pathology; D002675:Child, Preschool; D005260:Female; D006454:Hemoglobins / Q000032:analysis; D006801:Humans; D007223:Infant; D007501:Iron / Q000008:administration & dosage; D008297:Male; D008533:Megakaryocytes / Q000166:cytology; D013921:Thrombocytopenia / Q000209:etiology* / Q000503:physiopathology / Q000628:therapy
chemical_list: D006454:Hemoglobins; D007501:Iron