title: Prevalence of iron deficiency in children with Down syndrome.
abstract: OBJECTIVE
  To determine the prevalence of iron deficiency (ID) and iron deficiency anemia (IDA) in a sample of children with Down syndrome (DS) and to evaluate the effect of macrocytosis on the diagnosis of ID/IDA in these children.
  
  
  METHODS
  Children with DS ≥ 12 months of age who were followed at the Duke University Medical Center Comprehensive DS Clinic from December 2004 to March 2007 were screened for ID/IDA with a complete blood count, reticulocyte count, iron panel, and erythrocytic protoporphyrins.
  
  
  RESULTS
  A total of 114 children were enrolled, with a median age of 4.7 years. ID was identified in 12 subjects (10%), and IDA was identified in 3 subjects (3%). ID/IDA would not have been accurately diagnosed in 13 of 15 subjects (86%) if red blood cell (RBC) indices alone had been used for screening. Abnormal RBC indices with low transferrin saturation were 100% sensitive for ID/ IDA screening.
  
  
  CONCLUSIONS
  Prevalence of ID/IDA in children with DS was comparable with that in the general pediatric population. Macrocytosis had implications for screening of ID/IDA with only RBC indices. We suggest ID/IDA screening in DS children be done with a laboratory panel at least including complete blood count, reticulocyte count, transferrin saturation, and serum ferritin.
authors.affiliation: Department of Pediatrics, Hematology-Oncology, Duke University Medical Center, Durham, NC, USA.
authors.forename: Natalia E
authors.initials: NE
authors.lastname: Dixon
authors.forename: Blythe G
authors.initials: BG
authors.lastname: Crissman
authors.forename: P Brian
authors.initials: PB
authors.lastname: Smith
authors.forename: Sherri A
authors.initials: SA
authors.lastname: Zimmerman
authors.forename: Gordon
authors.initials: G
authors.lastname: Worley
authors.forename: Priya S
authors.initials: PS
authors.lastname: Kishnani
mesh_terms: D000293:Adolescent; D018798:Anemia, Iron-Deficiency / Q000453:epidemiology* / Q000209:etiology*; D002648:Child; D002675:Child, Preschool; D004314:Down Syndrome / Q000150:complications*; D005260:Female; D006801:Humans; D007223:Infant; D000090463:Iron Deficiencies; D008297:Male; D015995:Prevalence; D011446:Prospective Studies; D055815:Young Adult