What does my serum iron result mean? Are additional tests needed?

For evidence-based information about Serum Iron Test, visit this page.

Should ferritin and transferrin saturation be evaluated alongside this result?

For evidence-based information about Serum Iron Test, visit this page.

Could my result be affected by daily variation or recent meals?

For evidence-based information about Serum Iron Test, visit this page.

What factors may be contributing to my result?

For evidence-based information about Serum Iron Test, visit this page.

How often should I be retested?

For evidence-based information about Serum Iron Test, visit this page.

Home → Tests → Serum Iron Test

Serum Iron Test

✅ Up to date🔬 Evidence: ModerateHematology

Diğer adları: Fe test, Iron blood test, Iron level

⚠️

Discuss your test results with your doctor. This page is for informational purposes only and does not provide a diagnosis.

⚡ Key Facts

• Measures the amount of iron bound to transferrin circulating in the blood • Does not reliably reflect iron status on its own — significant daily variation • Should be interpreted alongside ferritin, TIBC, and transferrin saturation • Affected by recent meals and time of day

🧪 What Does This Test Measure?

The serum iron test measures the amount of iron bound to transferrin circulating in the blood, representing only a small and variable fraction of total body iron.

📋 Why Is It Ordered?

Ordered for iron deficiency or iron overload evaluation, transferrin saturation calculation, and as part of a comprehensive iron panel.

🔧 Preparation

Serum iron is affected by daily variation and recent meals. Many laboratories recommend morning fasting collection for the most consistent results.

📊 Reference Ranges

Commonly used approximate ranges: Men: 65–175 µg/dL (11.6–31.3 µmol/L) Women: 50–170 µg/dL (9.0–30.4 µmol/L) ⚠️ Significant daily variation exists. Should be interpreted alongside ferritin and TSAT.

⬆️ High Values

Elevated serum iron may be associated with iron overload, hemochromatosis, repeated transfusions, excessive supplementation, or hemolytic anemias.

⬇️ Low Values

Low serum iron may be associated with iron deficiency, chronic disease anemia, inflammation, or inadequate dietary intake.

⚙️ What Can Affect Results?

Daily variation, recent meals, fasting duration, inflammation, iron supplements, and assay method may affect serum iron results.

🔬 Evidence Summary

Moderate evidence: 2 guidelines, 4 reviews, 2 observational studies.

✅ Key Takeaways

💡

What you learned: Serum iron fluctuates significantly throughout the day and with meals. It should always be interpreted alongside ferritin and transferrin saturation.

⛔

A serum iron result alone cannot diagnose iron deficiency or iron overload. It must be evaluated with ferritin, TIBC, and clinical context.

🔬 Sources Used on This Page

8 sources · Most recent publication: 2024

📋

Guideline

Expert society and guideline recommendations

sources

📖

Review

Comprehensive topic evaluation

sources

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Observational

Observational and cohort studies

sources

Overall assessment: Evidence level for this topic is moderate. This page is supported by 2 guidelines, 4 reviews, 2 observational studies.

📝 Questions to Ask Your Doctor

Be prepared for your appointment. Add questions to your list.

Last reviewed: 3/31/2026

Next review: 6/30/2026

⚖️ Comparisons

Ferritin vs Serum Iron→

🔗 Related Topics

🩺 Iron deficiency anemia🧪 Ferritin (Demir depoları)🧪 Hemogram (Tam kan sayımı)🧪 Transferrin satürasyonu (TSAT)🧪 TDBK (Toplam demir bağlama kapasitesi)

⚖️ This page does not replace medical advice. Make treatment decisions with your doctor.
Content is based on scientific studies indexed in PubMed and current clinical guidelines.