Subjects will be randomized to treatment in a 2:1 ratio (ferumoxytol: iron sucrose) and stratified by age group (2 to \<6 years; 6 to \<12 years; and 12 to \<18 years). Subjects will receive one of the following treatment regimens:
• Ferumoxytol: 7 mg Fe/kg IV (maximum 510 mg/dose) x 2 doses, the first dose administered on Day 1 and the second 2 to 8 days later.
OR
• Iron sucrose (Venofer®): 4 mg Fe/kg IV (maximum 200 mg/dose) x 5 doses, the first dose on Day 1 and subsequent doses administered at least once per week and up to 3 times/week. All subjects will be monitored at the study site through at least 1 hour after the completion of each infusion of study drug. Assessment of blood Hgb concentrations, adverse events, and other safety assessments will be performed through study Week 5.
