Iron deficiency in children with early chronic kidney disease.

Iron deficiency (ID) contributes to the development of anemia in patients with chronic kidney disease (CKD). The frequency of ID in children with early CKD has not previously been reported. This was a retrospective chart review of children with CKD stages 2 and 3 followed at the CKD clinic of Children's Hospital of Michigan. ID was defined as low ferritin and transferrin saturation <20%. Patients on iron supplements were considered as iron-deficient cases. There were 50 patients included in the study (72% male) with a mean age of 10.31 (±5.21). The mean glomerular filtration rate (GFR) was 55.4 ml/min/1.73 m(2) (±14.61). ID was present in 42% of patients, out of whom almost half (42.9%) presented with anemia. Females had a higher frequency of ID (64.3%). The frequency of ID with anemia increased from 4.3% to 29.6%, (p = 0.03) in stage 2 to stage 3 CKD, respectively. The frequency of ID without anemia also increased with progression of CKD from stage 2 to stage 3, however, the difference was not statistically significant. ID is frequent in patients with early CKD. Monitoring of iron tests and treatment of ID is important in this population of patients.