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Iron, Serum (Unspecified Method) – Total Iron Concentration

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of iron present in your blood serum. Iron is essential for making hemoglobin, which carries oxygen in your red blood cells.

Quick summary

["Iron levels help identify deficiencies or excesses that may affect your health."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
34714-6
Short code
INR Bld
Synonyms
INR Bld
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Ref low
0.8
Ref high
1.2
Critical range
— – 5 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
coag-tissue-factor-induced-inr
CPT
85610
SNOMED
396252006
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like fatigue, pale skin, or unusual tiredness. It could also be used to check for conditions like anemia, hemochromatosis (iron overload), or other blood disorders. Sometimes, doctors order it as part of routine blood work or to monitor treatment for iron-related issues.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 12 hours before the draw if iron levels are measured alongside other tests. Wear a loose shirt for easy access to your arm. If you’re pregnant, have a recent infection, or take certain medications, let your provider know.

What to Expect During the Test

A healthcare professional will insert a small needle into your arm to draw a blood sample. You may feel a brief pinch, but it’s usually over quickly. The blood is then sent to a lab for analysis. The process takes about 15 minutes total.

What the Results Mean

Results are compared to a reference range specific to your lab. Low iron levels may indicate anemia or poor absorption, while very high levels could suggest conditions like hemochromatosis or excessive iron intake. Your provider will discuss the results in the context of your overall health.

Reference range

INR: 0.8-1.2 (warfarin: 2.0-3.0)N/A

Specimen: whole-blood

Inform your healthcare provider if you are taking blood thinners. No special preparation required.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Total Iron

Frequently asked questions

How Might My Iron Levels Affect My Health?
Low iron levels (iron deficiency) can cause anemia, leading to fatigue, weakness, or pale skin. It may also affect your ability to concentrate or cause headaches. High iron levels can damage organs over time, increasing the risk of heart disease or liver problems. Your provider will interpret results based on your symptoms and medical history.
What If My Iron Test Is Abnormal?
If your results are outside the normal range, your provider may recommend further testing (like ferritin or transferrin saturation) or changes to your diet, supplements, or treatment plan. Follow-up may include monitoring iron levels periodically to ensure they stay stable.
How Often Should I Get This Test?
The frequency depends on your health status. People with iron deficiency anemia may need regular monitoring, while others with stable levels may only need testing if symptoms return or if certain conditions (like pregnancy or certain medications) are present.
  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 16, 2026. · Read our editorial policy