Initiating IV Iron Therapy in ESRD Patients with Anemia

Iron Status Thresholds for Initiating IV Iron

The American Journal of Kidney Diseases recommends initiating IV iron therapy in ESRD patients when transferrin saturation (TSAT) is ≤20% and/or serum ferritin is <100 ng/mL, regardless of whether they are receiving erythropoiesis-stimulating agents (ESAs) 1, 2
For hemodialysis patients, IV iron should be started when TSAT is ≤20% and/or ferritin is <100 ng/mL, with a target hemoglobin level of 11-12 g/dL 1, 2
Oral iron is not indicated for hemodialysis patients, as it fails to maintain adequate iron stores in most cases 1, 3

The American Journal of Kidney Diseases recommends administering 100-125 mg IV iron at every hemodialysis session for 8-10 doses 1, 2
An alternative dosing regimen is 500-1,000 mg iron dextran as a single infusion after a 25 mg test dose 1

Maintenance therapy requires 25-125 mg/week of IV iron to maintain target hemoglobin and iron parameters 1, 2
If TSAT remains ≤20% and/or ferritin remains <100 ng/mL after completing the initial course, administer another course of 100-125 mg per week for 8-10 weeks 1, 2

IV iron should be stopped when TSAT exceeds 50% and/or ferritin exceeds 800 ng/mL 1, 2
Consider stopping when ferritin exceeds 500 ng/mL, as evidence of benefit beyond this threshold is insufficient and risks may increase 4, 5, 6

Measure TSAT and ferritin at least every 3 months during maintenance therapy 1, 4
For patients not on ESA therapy with TSAT <20% and ferritin <100 ng/mL, monitor every 3-6 months 1

Functional iron deficiency is common in ESRD patients, and normal or elevated ferritin does not exclude iron deficiency 6
Ferritin acts as an acute-phase reactant and can be falsely elevated by inflammation, so always check TSAT alongside ferritin 6
Withhold IV iron during active infection, as iron is essential for microbial growth 3, 5