What is the likely diagnosis and recommended treatment for a patient with mild normocytic anemia, low ferritin, high serum iron, elevated total iron‑binding capacity, and high transferrin?

This Patient Does NOT Have Iron Deficiency Anemia

This patient has an unusual iron profile with very low ferritin (8 ng/mL) but paradoxically high serum iron (272 μg/dL), suggesting either a laboratory error, recent iron supplementation/transfusion, or a rare condition like sideroblastic anemia or hemochromatosis carrier state—not typical iron deficiency anemia. The labs should be repeated fasting, and if confirmed, hematology consultation is warranted.

Why This Is Not Classic Iron Deficiency Anemia

The iron studies are internally contradictory:

• Ferritin is extremely low (8 ng/mL) - diagnostic of depleted iron stores 1, 2
• BUT serum iron is markedly elevated (272 μg/dL) - normal range is typically 60-170 μg/dL
• TIBC is elevated (424 μg/dL) - consistent with iron deficiency
• Transferrin is elevated (339 mg/dL) - consistent with iron deficiency

In true iron deficiency anemia, serum iron should be low, not high. The combination of low ferritin with high serum iron is physiologically inconsistent with straightforward iron deficiency 3.

Differential Diagnosis to Consider

Most Likely Explanations:

1. Laboratory error or timing issue

   • Recent oral/IV iron supplementation before blood draw
   • Non-fasting sample
   • Hemolyzed specimen

2. Sideroblastic anemia

   • Normocytic anemia (MCV 82.2) with ineffective erythropoiesis
   • Iron accumulates but cannot be incorporated into hemoglobin
   • Results in low ferritin but high serum iron

3. Thalassemia trait with concurrent iron deficiency

   • RDW is elevated (16.6), suggesting mixed pathology
   • Would need hemoglobin electrophoresis 2

4. Early hemochromatosis carrier state with blood loss

Immediate Next Steps

1. Repeat Iron Studies Fasting

• Draw in morning, fasting state
• No iron supplements for 48 hours prior
• Calculate transferrin saturation: (Serum Iron ÷ TIBC) × 100
  • Current calculation: (272 ÷ 424) × 100 = 64% saturation
  • This is markedly elevated (normal <45%)
  • In true iron deficiency, transferrin saturation should be <20% 2, 4

2. Additional Testing Needed

• Hemoglobin electrophoresis - rule out thalassemia 2
• Peripheral blood smear - look for ring sideroblasts, target cells
• Reticulocyte count - assess bone marrow response
• Vitamin B12 and folate - rule out combined deficiency
• Haptoglobin and indirect bilirubin - rule out hemolysis

3. Hematology Referral

Given the contradictory iron studies and normocytic anemia with elevated RDW, this patient needs subspecialty evaluation 1. This is not a straightforward case that should be empirically treated with iron supplementation.

Common Pitfalls to Avoid

• Do NOT start empiric iron therapy based solely on low ferritin when serum iron is elevated
• Do NOT assume this is simple iron deficiency - the high serum iron contradicts this
• Do NOT order bidirectional endoscopy yet - first clarify the diagnosis with repeat labs and hematology input
• Ferritin <15 ng/mL is highly specific for iron deficiency (specificity 0.99) 2, but the elevated serum iron overrides this in clinical decision-making

If Labs Confirm True Iron Deficiency (Unlikely)

Only if repeat testing shows low serum iron with low ferritin should you proceed with:

• Gastrointestinal evaluation - bidirectional endoscopy in this adult patient 1, 2
• Celiac serology - tissue transglutaminase IgA 1
• H. pylori testing - noninvasive stool antigen or urea breath test 1, 4
• Oral iron supplementation - ferrous sulfate 325 mg every other day on empty stomach 1, 4
• Reassess in 2-4 weeks - hemoglobin should rise 1-2 g/dL 4