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Iron, Serum or Plasma Concentration (Mass Concentration)

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

This test measures the amount of iron present in your blood, which is important for making healthy red blood cells and preventing anemia.

Quick summary

["Iron levels help doctors check if you have enough iron to stay healthy and prevent fatigue or weakness."]

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

Key facts at a glance

LOINC
46418-0
Short code
INR BldC
Synonyms
INR BldC
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 Might You Need This Test?

Your healthcare provider may order this test if you have symptoms like extreme tiredness, pale skin, shortness of breath, or if you’re at risk for iron deficiency—such as during pregnancy, heavy menstrual periods, or after certain surgeries or treatments.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the test if it’s drawn from your vein. If it’s a urine test, you might need to collect a sample at home.

How the Test Works

Blood is drawn from a vein in your arm (serum/plasma) or, less commonly, urine may be tested. The lab uses a sensitive method to measure iron levels in your sample.

What the Results Mean

Results are compared to a standard range for your age, sex, and overall health. Low levels may indicate iron deficiency, while very high levels could signal conditions like hemochromatosis.

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

Iron Level

Frequently asked questions

What causes low iron levels?
Low iron levels can result from poor diet (not enough iron-rich foods), heavy blood loss (like from heavy periods or injuries), pregnancy, or certain medical conditions that affect iron absorption.
What causes high iron levels?
High iron levels are often linked to conditions like hemochromatosis (a genetic disorder), excessive red blood cell transfusions, or long-term alcohol use, which can overwhelm the body’s iron regulation.
Can I prevent iron-related issues?
Yes! Eat iron-rich foods (like lean meats, spinach, or fortified cereals) and vitamin C (which helps absorb iron). If you have a history of iron issues, your doctor may recommend supplements or monitoring.
  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