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Iron, Serum or Plasma Concentration

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

This test measures the amount of iron present in your blood, either in serum or plasma. Iron is an essential mineral that helps carry oxygen in your red blood cells.

Quick summary

["Iron levels help doctors check for iron deficiency or excess, which can affect energy and health."]

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

Key facts at a glance

LOINC
14797-5
Short code
Iron SerPl-Imp
Synonyms
Iron SerPl-Imp
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 Is Done

Your doctor may order this test to diagnose or monitor conditions like anemia (low red blood cells), excessive bleeding, or certain liver diseases. It can also help assess iron overload in conditions such as hemochromatosis.

What to Expect Before the Test

No special preparation is usually needed. You may be asked to fast for 8–12 hours before the test if it involves a blood draw, but this depends on the lab’s instructions. Avoid taking iron supplements for 24 hours before testing if possible.

How the Test Is Performed

A healthcare provider will draw blood from a vein in your arm using a small needle. You may feel a brief pinch, but the procedure is quick and usually painless. The blood sample is then sent to a lab for analysis.

What the Results Mean

Results are compared to a reference range that varies by lab and individual factors like age, sex, and overall health. Low iron levels may indicate anemia or poor absorption, while very high levels could signal conditions like hemochromatosis or excessive intake.

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.

Iron levels are critical for preventing anemia, which can cause fatigue, weakness, or pale skin. Low levels may also signal underlying health issues like gastrointestinal bleeding or malabsorption disorders. High levels can lead to organ damage or heart problems if untreated.

Short name

Iron Level

Frequently asked questions

What causes low iron levels?
Low iron levels (iron deficiency) can result from poor diet, chronic blood loss (such as heavy menstrual bleeding or gastrointestinal issues), or conditions that affect iron absorption (like celiac disease). Pregnancy or rapid growth periods may also deplete iron stores.
What causes high iron levels?
High iron levels are often linked to conditions like hemochromatosis, where the body absorbs too much iron. Excessive iron intake from supplements or frequent blood transfusions can also raise levels. Rarely, certain medications or liver diseases may contribute.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on the lab. Your doctor will contact you once they are ready, either by phone or through your health records portal.
  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