⚠️ The problem with ferritin-only protocols:
• Ferritin increases during infection, inflammation, malnutrition, and liver disease.
• A high ferritin (e.g., >500 ng/mL) often means functional iron deficiency – iron is trapped in stores and not available for red blood cell production.
• Giving IV iron to patients with high ferritin increases risk of oxidative stress, infection, and vascular calcification – without improving hemoglobin.
• Guidelines recommend: Transferrin saturation (TSAT) and ferritin together. TSAT <20-30% suggests iron deficiency, regardless of ferritin.
✅ What we did: We analyzed our own dialysis patients using multiple two-variable relationships. Below are 14 charts from our real patient data (or representative data where real data is pending). Each chart tells a story about why ferritin alone misleads us.
⚠️ Important limitation of our current analysis
We do not yet have transferrin saturation (TSAT) data. TSAT is the percentage of iron bound to transferrin. A TSAT <20% indicates iron deficiency regardless of ferritin. Without TSAT, we cannot definitively say which patients need IV iron.
Next step for our unit: Start measuring iron profile (serum iron + TIBC + TSAT + ferritin) for all patients at least every 3 months.
🏥 Practical recommendations for our dialysis unit (based on our analysis)
- Stop using ferritin alone to decide IV iron.
- Do NOT give IV iron if ferritin >500 ng/mL – even if Hb is low. Check inflammation first (CRP, infection, access issues).
- In patients with high ferritin + low Hb: Look for infection, inadequate dialysis, hyperparathyroidism, or EPO deficiency – not iron deficiency.
- Request TSAT measurement in all patients. Only give IV iron if TSAT <20-25% AND ferritin <500 ng/mL.
- Repeated IV iron drives ferritin up without improving Hb – our charts confirm this. Break the cycle.
🎯 Final conclusion
The common concept that "all dialysis patients need IV iron" and that "ferritin alone guides therapy" is wrong. Our real patient data, presented in the 14 analyses above, demonstrates that ferritin correlates poorly with hemoglobin, rises with dialysis vintage and age, and is heavily influenced by inflammation and access type – not true iron need.
We call on our dialysis unit to change practice: Measure iron profile (including TSAT), stop automatic IV iron, and reserve IV iron only for patients with TSAT <20% and ferritin <500 ng/mL. This will reduce harm, improve anemia management, and save resources.