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Granulocyte Colony-Stimulating Factor (CSF) in Serum/Plasma

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

This test measures the levels of granulocyte colony-stimulating factor (CSF), a protein that helps your body produce and release white blood cells, particularly neutrophils, which fight infections.

Quick summary

["CSF helps your immune system respond to infections by boosting white blood cell production."]

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

Key facts at a glance

LOINC
30208-3
Short code
C immitis IgM CSF Ql
Synonyms
C immitis IgM CSF Ql
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

What Is Granulocyte Colony-Stimulating Factor (CSF)?

Granulocyte colony-stimulating factor (CSF) is a protein produced naturally in the body to stimulate the bone marrow to produce more neutrophils—a type of white blood cell that plays a key role in fighting bacterial infections. Low levels may indicate impaired immune function or certain medical conditions.

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms like frequent infections, low white blood cell counts, or if you’re undergoing treatment (like chemotherapy) that could affect your immune system. It may also be checked before bone marrow or stem cell transplants.

How Is the Test Performed?

A blood sample is drawn from a vein, usually in your arm. The sample is sent to a lab to measure CSF levels using an immunoassay method, which detects the protein in your serum or plasma.

What Do Results Mean?

Results are not typically provided as a single numeric range since CSF levels can vary based on medical conditions, treatments, or other factors. Your doctor will interpret the result in the context of your overall health and symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

CSF Level

Frequently asked questions

Why might my doctor be concerned about my CSF levels?
Low CSF levels may suggest conditions like neutropenia (low neutrophil count), certain cancers, or immune system disorders. High levels could indicate inflammation, infections, or responses to treatments like chemotherapy. Your doctor will discuss findings with you based on your medical history.
How long will it take to get my results?
Test results are usually available within 1–3 business days, depending on lab processing times. Your doctor will contact you once results are ready.
Can I eat or drink anything before the test?
No special preparation is needed for this test. You can eat, drink, or take medications as usual on the day of the test.
  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