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Iron (Serum) Concentration

Published: August 9, 2026Updated: August 17, 2026

This test measures the amount of iron present in your blood serum, which helps assess iron stores and identify potential deficiencies or excesses.

Quick summary

["Iron levels help determine if you have anemia or iron overload."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
109420-0
Short code
Iron Msmt Fld
Synonyms
Iron Msmt Fld
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
60
Ref high
170
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
83540
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your doctor may order this test if you have symptoms like fatigue, pale skin, weakness, or unusual tiredness. It’s also used to check for iron deficiency anemia, especially after heavy blood loss or poor diet. Rarely, it may be done to monitor iron overload conditions, such as hemochromatosis.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours before the test if your blood is drawn early in the morning. Wear a loose shirt for easy access to your arm.

During the Test

A healthcare provider will insert a small needle into your arm to draw blood. You may feel a slight pinch, but it usually takes only a few seconds. The blood sample is then sent to a lab for analysis.

After the Test

You can return to your normal activities immediately. Apply gentle pressure to the puncture site to stop any bleeding, and check for signs of infection (e.g., increased redness or swelling). Avoid heavy lifting or strenuous activity for a few hours.

Reference range

NCBI: Serum Iron Male 65-180; Female 50-170 µg/dLN/A

Specimen: serum

Fasting for 12 hours preferred. Iron supplements should be stopped 24 hours before if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Low iron levels may indicate anemia, poor nutrient absorption, or excessive blood loss. High iron levels can signal conditions like hemochromatosis or excessive vitamin C intake. Your doctor will interpret results in the context of your symptoms, medical history, and other tests.

Short name

Iron Level

Frequently asked questions

What causes low iron levels?
Low iron levels can result from dietary deficiencies, chronic blood loss (e.g., heavy periods, gastrointestinal bleeding), poor absorption (e.g., celiac disease), or increased demand (e.g., pregnancy).
What are the symptoms of iron deficiency?
Symptoms may include fatigue, pale skin, brittle nails, cold hands/feet, dizziness, or an unusual craving for non-food items (pica). Some people may not notice symptoms until anemia is severe.
How is iron overload treated?
Treatment for iron overload depends on the cause. If due to hemochromatosis, phlebotomy (bloodletting) or medications may be recommended. Dietary changes (e.g., limiting iron-rich foods) and avoiding supplements with iron can also help.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 17, 2026. · Read our editorial policy