An iron infusion is a medical procedure in which a combination of iron and saline solution is delivered directly into the bloodstream through a vein, in patients suffering from iron deficiency, iron-deficiency anemia, and chronic kidney disease. Iron infusions are recommended when oral iron supplementation fails to adequately restore iron and hemoglobin levels in the blood. The intravenous method is a fast and effective way of delivering iron throughout the body, used as iron can be administered instantly rather than gradually over time. Iron deficiency is one of the most common nutritional deficiencies affecting up to two billion people worldwide. Intravenous iron infusions are used to treat patients with iron deficiency, iron-deficiency anemia, and chronic kidney disease. IV iron infusions are prescribed when gastrointestinal absorption is poor or when an urgent increase in hemoglobin levels is required for severely anemic patients, such as women in pregnancy. During an iron infusion, a healthcare provider will clean the area where the IV will go into the skin on your arm or hand, put a needle into the vein they select, and then deliver a dose of iron through the vein with an IV drip. Iron infusions may take up to several hours, whereas iron injections deliver a whole dose immediately. Iron infusions are usually prescribed by doctors to treat iron deficiency anemia, and they are usually administered at a hospital or hemodialysis center.