What is the significance of a total iron-binding capacity of 231 µg/dL and a ferritin level of 200 ng/mL?

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Last updated: September 16, 2026 • View editorial policy

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Interpretation of TIBC 231 µg/dL and Ferritin 200 ng/mL

Your iron studies show a low-normal TIBC (231 µg/dL) with a ferritin of 200 ng/mL, which indicates adequate iron stores and argues strongly against iron deficiency anemia. This pattern does not warrant gastrointestinal investigation for iron deficiency.

Understanding Your Results

Ferritin Level (200 ng/mL)

Your ferritin of 200 ng/mL is well above all diagnostic thresholds for iron deficiency:

  • Far exceeds the 45 ng/mL threshold that guidelines recommend for optimal sensitivity/specificity in diagnosing iron deficiency 1, 2
  • Above the 150 ng/mL level where iron deficiency becomes extremely unlikely, even in the presence of inflammation 2
  • In the normal-to-elevated range, suggesting adequate or possibly increased iron stores 3

TIBC Level (231 µg/dL)

Your TIBC of 231 µg/dL is in the low-normal range (typical reference range 250-450 µg/dL):

  • TIBC rises in iron deficiency as the body attempts to mobilize all available iron 4
  • Your low-normal TIBC further confirms you do not have iron deficiency
  • Low TIBC can occur with adequate iron stores, inflammation, or in certain chronic conditions 5, 6

Clinical Significance

This combination (ferritin 200 ng/mL + low-normal TIBC) excludes iron deficiency anemia. The pattern suggests:

  1. Adequate iron stores - No need for iron supplementation
  2. No indication for GI investigation - Guidelines recommend investigation when ferritin is <45 ng/mL 1, 2
  3. Possible inflammation or chronic disease - If you have anemia despite these iron parameters, consider anemia of chronic disease rather than iron deficiency

Important Caveats

  • If you are anemic (low hemoglobin) despite these iron studies, the anemia is not due to iron deficiency
  • Look for other causes: chronic kidney disease, chronic inflammation, vitamin B12/folate deficiency, hemoglobinopathies
  • In hemodialysis patients specifically, low TIBC may indicate malnutrition or predict adverse outcomes 5, 7, 6, but this is a specialized context
  • If you have GI symptoms (bleeding, weight loss, abdominal pain), investigation may still be warranted for those symptoms—not for iron deficiency

What to Monitor

Check complete blood count (CBC) to assess for anemia. If anemia is present with these iron parameters, evaluate for:

  • Inflammatory markers (CRP, ESR)
  • Kidney function (creatinine, eGFR)
  • Vitamin B12 and folate levels
  • Consider hemoglobin electrophoresis if microcytosis is present with normal iron studies 2

References

3
Research

The measurement and interpretation of serum ferritin.

Annals of clinical and laboratory science, 1980

5
Research

Total iron-binding capacity-estimated transferrin correlates with the nutritional subjective global assessment in hemodialysis patients.

American journal of kidney diseases : the official journal of the National Kidney Foundation, 1998

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.