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Granulocyte Colony-Stimulating Factor (G-CSF) Level, Serum/Plasma

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

This test measures the level of granulocyte colony-stimulating factor (G-CSF) in your blood. G-CSF helps stimulate the production of white blood cells, particularly neutrophils, which play a key role in fighting infections.

Quick summary

["G-CSF helps your body produce healthy white blood cells to fight infections."]

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

Key facts at a glance

LOINC
102805-9
Short code
Radish IgG RAST
Synonyms
Radish IgG RAST
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
10
Ref high
40
Critical range
— – 500 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
rast
CPT
84484
SNOMED
302774002
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’re undergoing chemotherapy, radiation therapy, or other treatments that can reduce your white blood cell count. It may also be checked before or after bone marrow or stem cell transplants, or if you have a condition that affects your immune system.

What to Expect Before the Test

No special preparation is usually needed. You may have a blood draw from a vein in your arm. If you’re on blood thinners or have a history of bleeding disorders, let your provider know before the test.

What the Test Results Mean

Low levels of G-CSF might indicate an immune system disorder or side effects from treatments that suppress white blood cells. High levels could suggest inflammation or certain cancers. Your provider will interpret results in the context of your overall health and medical history.

Common Conditions Monitored

This test is often used to monitor patients receiving treatments like chemotherapy, those with severe neutropenia (low neutrophil count), or individuals recovering from bone marrow transplants.

Reference range

Adult: 10-40 U/LN/A

Specimen: serum

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

G-CSF Level

Frequently asked questions

What does a G-CSF test measure?
A G-CSF test measures the amount of a protein in your blood that helps your body produce more white blood cells, particularly neutrophils, which help fight infections.
How is G-CSF tested?
G-CSF levels are measured using a blood sample drawn from a vein. The sample is typically sent to a lab for analysis using immunoassay methods, which detect the protein in your serum or plasma.
Can diet or medications affect G-CSF levels?
Certain medications (like some chemotherapy drugs) or dietary supplements may influence white blood cell production, indirectly affecting G-CSF levels. Always discuss your medications and diet with your healthcare provider before 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 17, 2026. · Read our editorial policy