Neutrophil Segment Count in Whole Blood

What Is a Neutrophil Count?

Neutrophils are a type of white blood cell that plays a critical role in your body’s immune response. They are the most abundant type of white blood cell and are primarily responsible for fighting bacterial infections. A neutrophil count helps doctors assess your immune function and detect signs of infection, inflammation, or other health conditions.

Why Might You Need This Test?

Your doctor may order a neutrophil count to diagnose or monitor conditions such as infections (like pneumonia or urinary tract infections), certain blood disorders (like leukemia), or inflammatory diseases. It can also help evaluate your response to treatment for these conditions.

How Is the Test Performed?

A small amount of blood is drawn from a vein, usually in your arm. The blood sample is then analyzed in a lab to count the number of neutrophils. This test is typically done as part of a complete blood count (CBC), but it can also be performed separately.

What Do Results Mean?

Results are usually reported as a percentage or absolute count of neutrophils in your blood. While specific reference ranges can vary by lab, abnormal results may indicate too few (hyponeutropenia) or too many (hyperneutropenia) neutrophils, which can signal underlying health concerns.