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Aarti Merai: Decoding Iron Panels in Clinical Practice
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May 7, 2026, 05:35

Aarti Merai: Decoding Iron Panels in Clinical Practice

Aarti Merai, Medical Laboratory Technologist, shared a post on LinkedIn:

“Serum Iron versus Serum Ferritin: What’s the Difference – and Why It Matters?

In clinical practice, these two markers are often used interchangeably – but they tell very different stories about iron status.

Serum Iron

This measures the amount of circulating iron bound to transferrin in the blood at a given moment.

It’s dynamic and influenced by:

  • Recent dietary intake
  • Diurnal variation (higher in the morning)
  • Acute illness

In short: Serum iron reflects what’s ‘in transit’, not what’s stored.

Serum Ferritin

Ferritin is the body’s primary iron storage protein.

Serum ferritin levels correlate with total iron reserves.

This makes ferritin the most reliable early marker of iron deficiency.

However, there’s a caveat:

Ferritin is also an acute-phase reactant.

It can be elevated in:

  • Inflammation
  • Infection
  • Liver disease

Clinical Insight

  • Low serum iron plus low ferritin – Iron deficiency
  • Low serum iron plus normal/high ferritin – Consider anemia of chronic disease
  • Normal serum iron is not equal to adequate iron stores

Bottom Line

If you’re evaluating iron status, don’t rely on a single parameter.

Interpretation should always be contextual – integrating ferritin, transferrin saturation, CRP, and the clinical picture.

Because in medicine, numbers don’t exist in isolation – patients do.”

Aarti Merai: Decoding Iron Panels in Clinical Practice

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Aarti Merai Health Hematology Hemostasis News Hemostasis Today Medicine Serum Ferritin Serum Iron Transferrin
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