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Minerals

Serum Iron: Normal Values and What a Low Iron Means

Serum iron testing provides insight into your current iron availability. Combined with ferritin and TIBC, it supports comprehensive iron status assessment and early intervention.

Doctor's Assessment Included

Reference Ranges

See the value that applies to you:

Choose male or female — this range differs by sex.

Enter your age — this range changes with age.

This range also depends on context such as cycle phase or sample material; the highlighted rows apply to your group.

Your reference range
umol/l
6 39 umol/l
Reference ranges by group, in umol/l
Male · 6–12 years 7–30 umol/l
7 30
Male · 13–18 years 9–35 umol/l
9 35
Male · 19–50 years 8–39 umol/l
8 39
Male · 51–65 years 8–35 umol/l
8 35
Male · 66–80 years 7–31 umol/l
7 31
Male · 81 years and older 8–29 umol/l
8 29
Female · 6–12 years 7–31 umol/l
7 31
Female · 13–18 years 6–35 umol/l
6 35
Female · 19–50 years 7–35 umol/l
7 35
Female · 51–65 years 8–30 umol/l
8 30
Female · 66–80 years 8–30 umol/l
8 30
Female · 81 years and older 7–28 umol/l
7 28
6 39 umol/l

Source: NVKC Reference population: Nederlandse huisartsenpopulatie (NUMBER, n=7.574.327)

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

Check your own value

What It Measures

This test measures the amount of iron bound to transferrin in your blood at the time of testing. It reflects your current iron availability rather than long-term stores.

Why It Matters

Iron is vital for producing red blood cells and carrying oxygen. Both low and high levels can affect your health. Serum iron is best interpreted alongside ferritin and TIBC for a complete picture. Consult your healthcare provider.

When to Test

Testing may be recommended if you experience fatigue, weakness, or shortness of breath. It is often part of an iron studies panel when evaluating anaemia or iron metabolism disorders.

Symptoms

Low Levels

Low serum iron may be associated with fatigue, pale skin, weakness, dizziness, cold hands and feet, and difficulty concentrating.

High Levels

High serum iron may be associated with joint pain, fatigue, abdominal pain, and skin changes. Chronically elevated iron can damage organs and requires medical evaluation.

Recommendations

Male

If Low

Low iron may indicate iron deficiency anemia or blood loss. Consider iron supplementation and evaluation for GI bleeding.

If High

High iron may indicate hemochromatosis or excessive supplementation. Consider genetic testing and reduce iron supplement intake.

Female

If Low

Low iron is common in women due to menstruation. Consider iron supplementation (25-50 mg daily) with vitamin C for better absorption.

If High

High iron may indicate hemochromatosis or excessive supplementation. Consider genetic testing and reduce iron supplement intake.

Lifestyle Tips

Eat a balanced diet with iron-rich foods. Pair plant-based iron with vitamin C for better absorption. Avoid excessive iron supplementation without medical guidance, as too much iron can be harmful.

Frequently Asked Questions

Why does serum iron fluctuate?
Serum iron levels can vary throughout the day, with meals, and due to recent iron intake. For the most accurate results, testing is typically done in the morning while fasting.
What is the difference between serum iron and ferritin?
Serum iron reflects current circulating iron, while ferritin indicates stored iron. Together, they give a more complete picture of your iron status.
Can diet alone correct low iron?
Mild deficiencies may improve with dietary changes, but significant deficiencies may require supplementation. Always consult your healthcare provider for appropriate guidance.

Test Products

This marker is included in the following test panels.

Whoop

A 44-biomarker comprehensive health panel inspired by WHOOP Advanced Labs — a deep look at metabolism, cardiovascular risk, hormones, liver, kidney and inflammation.

SHBG (Sex Hormone Binding Globulin) TSH (Thyroid Stimulating Hormone) ALT (Alanine Aminotransferase) LDL Cholesterol Cortisol DHEA-S Estradiol (E2) Free Testosterone FSH (Follicle Stimulating Hormone) LH (Luteinizing Hormone) Total Testosterone Bicarbonate Calcium Chloride Ferritin Iron (Serum) Magnesium Potassium Sodium Transferrin CRP (C-Reactive Protein) Homocysteine Glucose (Fasting) HbA1c (Glycated Hemoglobin) ApoB (Apolipoprotein B) HDL Cholesterol Omega-3 Index Total Cholesterol Albumin HOMA-IR ALP (Alkaline Phosphatase) AST (Aspartate Aminotransferase) Bilirubin (Total) Total Protein Urea (BUN) Creatinine Vitamin D (25-OH) eGFR (Estimated Glomerular Filtration Rate) Insulin (Fasting) Leukocyte Differential Transferrin Saturation Lipoprotein(a) Triglycerides Basic Blood Count
€499,-

InsideTracker

A 36-biomarker performance and longevity panel inspired by InsideTracker Ultimate — covering heart, hormones, metabolism, inflammation, recovery and iron status.

SHBG (Sex Hormone Binding Globulin) TSH (Thyroid Stimulating Hormone) ALT (Alanine Aminotransferase) LDL Cholesterol GGT (Gamma-Glutamyl Transferase) Cortisol DHEA-S Estradiol (E2) Free Testosterone Total Testosterone Folate (Folic Acid) Vitamin B12 Calcium Ferritin Iron (Serum) Magnesium Magnesium (Intracellular) Potassium Progesterone Sodium Transferrin CRP (C-Reactive Protein) Glucose (Fasting) HbA1c (Glycated Hemoglobin) ApoB (Apolipoprotein B) HDL Cholesterol Total Cholesterol Albumin AST (Aspartate Aminotransferase) Vitamin D (25-OH) Insulin (Fasting) Leukocyte Differential Creatine Kinase (CK) Transferrin Saturation Triglycerides Basic Blood Count
€399,-

Iron (Serum)

€10,-