Total Dose Infusion of Ferumoxytol(1020mg) in 15 Minutes for Iron Deficiency Anemia

Inclusion Criteria: * Iron deficiency anemia intolerant of or failure to respond to oral iron or condition where oral iron is known to be ineffective or harmful. * Subject must be able to be contacted at 24-48 hours after dose and come for followup at four weeks. * Subject must be capable of understanding informed consent * No other form of iron may be taken within four weeks of consent or for four weeks after treatment Exclusion Criteria: * History of hypersensitivity to ferumoxytol. * Imminent dialysis. * Anemia due to other etiology. * Parenteral iron within 4 weeks of consent. * Pregnancy. * Erythropoiesis stimulating agent within 30 days of consent. * Other illness that would interfere with participation or understanding of trial. * Major surgery planned within four weeks of consent.