Neutrophil Absolute Count (Serum/Plasma)

What Is a Neutrophil Count?

Neutrophils are a type of white blood cell that plays a critical role in your immune response. They are often the first responders to infections, especially bacterial ones. The test measures their concentration in your blood, which can help doctors assess whether you have an infection, inflammation, or other conditions affecting your immune system.

Why Might Your Doctor Order 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), autoimmune diseases, or to evaluate how your body is responding to treatment for these conditions. It can also be used to check for signs of overactive immune responses or infections in people with weakened immune systems.

How Is This Test Performed?

A small blood sample is drawn from a vein, usually in your arm. The sample is then processed to separate the blood cells from the plasma or serum. The test measures the absolute number of neutrophils in the sample using automated blood testing technology.

What Are Common Results and What Do They Mean?

Results are typically reported as the absolute count of neutrophils per microliter (µL) of blood. A lower-than-normal count (neutropenia) may indicate an increased risk of infections, while a higher-than-normal count (neutrophilia) might suggest infection, inflammation, or other underlying health issues. Your doctor will interpret the results in the context of your overall health and symptoms.