Granulocyte Colony-Stimulating Factor (CSF) Level in Blood

What Is Granulocyte Colony-Stimulating Factor (CSF)?

Granulocyte colony-stimulating factor (CSF) is a protein produced by certain cells in the body, including the liver and bone marrow. It acts as a growth factor for neutrophils, a type of white blood cell critical for defending against bacterial infections. Low levels may indicate impaired immune response, while elevated levels can occur in response to inflammation or certain medical treatments.

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms like frequent infections, fatigue, or if you’re undergoing treatment that could affect your immune system, such as chemotherapy. It may also be checked in people with conditions like cancer, bone marrow disorders, or chronic infections.

Common Reasons for Testing

Tests for CSF levels are often done to assess immune function, monitor treatment responses, or diagnose underlying conditions like leukemia, aplastic anemia, or severe infections. It can help determine if your body is producing enough neutrophils to fight infections effectively.

How Is the Test Performed?

A blood sample is taken from a vein, usually in your arm. The sample is then sent to a lab for analysis. The test measures the concentration of CSF in your bloodstream, which can be influenced by various factors, including medications, infections, or genetic conditions.