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Iron (Serum or Plasma Mass Concentration)

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

This test measures the amount of iron present in your blood, which is important for making hemoglobin—the protein in red blood cells that carries oxygen throughout your body.

Quick summary

["Iron levels help assess whether you have too little or too much iron in your blood, which can affect energy, anemia, or other health conditions."]

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

Key facts at a glance

LOINC
50203-9
Short code
Iron sp6 SerPl-mCnc
Synonyms
Iron sp6 SerPl-mCnc
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 This Test Might Be Ordered

Your healthcare provider may order this test if you have symptoms like fatigue, weakness, pale skin, or shortness of breath, which can be signs of low iron (anemia). They might also check iron levels if you have conditions like heavy menstrual bleeding, poor diet, or certain medical treatments that affect iron absorption or storage.

What to Expect Before the Test

This test is typically done by drawing blood from a vein in your arm. You may feel a slight pinch when the needle is inserted, but it usually takes only a few minutes. No special preparation is needed unless your provider instructs otherwise.

What the Results Mean

Results help determine if your iron stores are adequate, low, or high. Low iron can lead to anemia, while high iron levels may indicate conditions like hemochromatosis or excessive intake.

Common Conditions Linked to Iron Levels

Low iron (hypochromic anemia) is common in people with poor diets, heavy periods, or conditions like celiac disease or gastrointestinal bleeding. High iron levels can be linked to genetic disorders, repeated blood transfusions, or excessive iron supplements.

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.

Clinical Significance

Short name

Iron Level

Frequently asked questions

What causes my iron levels to be abnormal?
Abnormal iron levels can result from dietary deficiencies, chronic blood loss (such as from heavy periods or gastrointestinal issues), genetic disorders (like hemochromatosis), or certain medications. Your provider will consider your symptoms, medical history, and other test results to determine the cause.
How often should I get this test?
The frequency depends on your health status. If you have a known condition affecting iron (like anemia or hemochromatosis), your provider may recommend regular monitoring. Otherwise, tests are usually ordered as needed for symptoms or specific concerns.
Can I adjust my diet or supplements to affect iron levels?
Yes, diet and supplements can influence iron levels. Eating iron-rich foods (like lean meats, spinach, or fortified cereals) or taking iron supplements (if prescribed) may help raise low levels. However, avoid excessive iron intake unless directed by your provider, as too much can be harmful.
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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