A Study to Evaluate Ferumoxytol for the Treatment of Iron Deficiency Anemia (IDA) in Pediatric Subjects

Inclusion Criteria: 1. Male or female 2 years to \<18 years of age at time of consent 2. Has IDA defined as: 1. Hemoglobin (Hgb) \<11.0 g/dL AND 2. Any one or more of the following: * Transferrin saturation (TSAT) \<20% * ferritin \<100 ng/mL 3. Documented history of unsatisfactory oral iron therapy or in whom oral iron cannot be tolerated, or for whom oral iron is considered medically inappropriate Exclusion Criteria: 1. Known hypersensitivity reaction to any component of ferumoxytol or iron sucrose 2. History of allergy to intravenous (IV) iron 3. History of ≥2 clinically significant drug allergies 4. Subjects with CKD (defined as eGFR of \<60 mL/min/1.73 m2 or a requirement for chronic hemodialysis or peritoneal dialysis during Screening) 5. Low systolic blood pressure (BP) (age 1 to 9 years \<70 + \[age in years x 2\] mmHg, age 10 to 17 years \<90 mmHg) 6. Hgb ≤7.0 g/dL 7. Serum ferritin level \>600 ng/mL