Granulocyte Colony-Stimulating Factor (G-CSF) Level
This test measures the level of Granulocyte Colony-Stimulating Factor (G-CSF) in your blood. G-CSF is a protein that helps stimulate the production of white blood cells, particularly neutrophils, which are important for fighting infections.
["G-CSF helps your body produce more white blood cells to support your immune system."]
Key facts at a glance
- LOINC
- 102721-8
- Short code
- Codfish IgG RAST
- Synonyms
- Codfish 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 have low neutrophil counts (neutropenia), are recovering from chemotherapy, undergoing bone marrow transplant, or experiencing conditions that affect white blood cell production. It may also be used to monitor treatment response in certain cancers or infections.
What to Expect Before the Test
No special preparation is needed for this blood test. You may have a small needle inserted into your arm or hand to draw a blood sample. If you’re undergoing chemotherapy or a bone marrow transplant, your provider may explain how this test fits into your treatment plan.
What the Results Mean
Results can vary based on your health status and treatment. Elevated levels may indicate an active infection, certain cancers, or response to G-CSF therapy. Low levels could suggest neutropenia, bone marrow disorders, or other immune system issues. Your provider will interpret the results in the context of your overall health.
Common Reasons for Testing
This test is often used in oncology to track neutrophil recovery after chemotherapy, in stem cell transplant settings to monitor immune cell production, or in infectious disease management to assess immune support.
Reference range
Adult: 10-40 U/LN/A
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
Frequently asked questions
What Does a High Level of G-CSF Indicate?
What Does a Low Level of G-CSF Indicate?
How Often Should This Test Be Done?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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