Neutrophil count in peripheral blood (absolute)

What Neutrophils Do in Your Body

Neutrophils are a key part of your immune system. They quickly respond to infections, such as bacterial ones, by moving to the site of injury or illness and destroying pathogens. They also help reduce inflammation by clearing dead cells and debris. When your body needs extra protection—like after surgery, during severe illness, or if you have a weakened immune system—your neutrophil count may rise to support this effort.

When Might You Need This Test?

Your doctor may order an absolute neutrophil count if you have symptoms like frequent infections, slow healing of wounds, fever without a clear cause, or if you’re undergoing treatments that can affect your immune system, such as chemotherapy. It’s also checked in people with certain blood disorders or autoimmune conditions.

How Is This Test Performed?

A small sample of your blood is drawn from a vein, usually in your arm. The blood is then analyzed in a lab to count the number of neutrophils. This test is quick and painless, and the results help your healthcare provider assess your immune health.

What Do the Results Mean?

Results are compared to standard ranges for healthy adults. Very low neutrophil counts (below normal) may indicate conditions like neutropenia, which can make you more susceptible to infections. Very high counts might suggest inflammation, infection, or other underlying health issues. Your doctor will discuss the results with you in the context of your overall health.