Granulocyte Colony-Stimulating Factor (G-CSF) Level (Serum or Plasma)
This test measures the amount of granulocyte colony-stimulating factor (G-CSF) in your blood, a protein that helps stimulate the production of white blood cells, particularly neutrophils, which play a key role in fighting infections.
["G-CSF helps your body recover from treatments that lower white blood cell counts, like chemotherapy or certain infections."]
Key facts at a glance
- LOINC
- 102793-7
- Short code
- White Pepper IgG RAST
- Synonyms
- White Pepper 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 treatment that can reduce your white blood cell count, such as chemotherapy, radiation therapy, or certain infections. It may also be used to monitor your response to treatments like G-CSF injections, which are sometimes given to boost white blood cell production.
What to Expect Before the Test
No special preparation is usually needed. You may have a simple blood draw from a vein in your arm. If you’re taking G-CSF, your levels may be checked before, during, or after treatment to ensure it’s working effectively.
What the Results Mean
Results can vary depending on your medical condition and treatment. Low levels may indicate an immune system challenge, while elevated levels could suggest overstimulation of white blood cell production or certain medical conditions. Your healthcare provider will interpret the results in the context of your overall health and treatment plan.
Common Reasons for Monitoring
Healthcare providers monitor G-CSF levels to assess how well your body is responding to treatments that suppress white blood cell counts. It helps in adjusting medications or identifying potential side effects early.
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.
Clinical Significance
Short name
G-CSF
Frequently asked questions
What are the normal reference ranges for this test?
How often should I have this test?
Can I eat or drink before this test?
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