Treatment for Low Ferritin (Iron Deficiency)

Diagnosis and Treatment

Iron deficiency should be treated when it is associated with anemia and/or low ferritin levels, with oral iron supplementation being the first-line therapy for most patients at doses of 100-200 mg/day, while intravenous iron is reserved for specific cases of oral iron failure, malabsorption, or need for rapid repletion 1
Serum ferritin is the most specific indicator of depleted iron stores, especially when used with other tests to assess iron status 2

Typical doses of oral iron supplements are 100-200 mg/day of elemental iron, in divided doses, and recent data suggest better iron absorption and possibly fewer adverse effects with alternate day dosing 1
Gastrointestinal side effects are common, including constipation, diarrhea, and nausea 1
Dietary advice is important, and vitamin C should be co-ingested with non-heme iron sources to enhance absorption, while tea and coffee should be avoided around meal times as they impair iron absorption 3

IV iron administration is indicated for patients not reaching target therapeutic goal with oral supplementation, requiring fast supplementation, or with repeated failure of oral therapy, and when IV iron is required, risk minimization should be addressed as reactions during iron infusions may be life-threatening 1, 4
For significant iron deficiency requiring IV treatment, a single IV dose of whole-body iron replacement (1g) should be given over 15 minutes using one of the recent carbohydrate products 1

Iron supplementation in the presence of normal or high ferritin values is not recommended and is potentially harmful 1
For inflammatory bowel disease patients with anemia, intravenous iron should be considered as first-line treatment when disease is clinically active, with previous intolerance to oral iron, or with hemoglobin below 100 g/L 4
In athletes, particularly female athletes who are at higher risk of iron deficiency, regular monitoring is recommended (once per year in male players and twice per year in female players) 3

Failing to recognize that inflammation can mask iron deficiency by falsely elevating ferritin levels 1, 2
Ignoring dietary factors that affect iron absorption, such as inhibitors like tea/coffee, and enhancers like vitamin C 3
Not considering alternate day dosing, which may improve absorption and reduce side effects 1