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Serum Ferritin (Mass Concentration)

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

This blood test measures the amount of ferritin, a protein that stores iron in your body.

Quick summary

Ferritin helps assess iron stores and detect potential iron deficiency or iron overload.

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

Key facts at a glance

LOINC
86031-2
Short code
S pn Da sero 19F IgG 2:1 Ser-Rto
Synonyms
S pn Da sero 19F IgG 2:1 Ser-Rto
Category
coagulation
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
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 a ferritin test to check for conditions like anemia, chronic inflammation, or liver disease. It can also help evaluate iron levels before certain treatments, such as blood transfusions or chemotherapy.

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 doctor specifies it. Bring any medications you’re taking to your appointment.

What Happens During the Test?

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

What Do the Results Mean?

Results can indicate whether your body has enough iron stored (normal levels) or if you may have iron deficiency (low levels) or iron overload (high levels). Your doctor will interpret the results in the context of your overall health.

Frequently asked questions

How often should I get this test?
Your doctor will determine how often you need this test based on your health status, symptoms, or specific medical needs. Regular monitoring may be recommended if you have conditions like anemia, liver disease, or a history of blood disorders.
Does fasting affect ferritin test results?
Fasting may not significantly impact ferritin levels, but some labs recommend fasting to reduce variability from recent meals. Always follow your doctor’s instructions for preparation.
What are common causes of low ferritin?
Low ferritin can result from chronic blood loss (e.g., heavy periods, gastrointestinal bleeding), poor diet, malabsorption issues, or certain medications. Conditions like celiac disease or inflammatory bowel disease may also contribute.
  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