Neutrophil count (with differential breakdown: mature neutrophils, band neutrophils, and possibly other immature forms)

What Is a Neutrophil Count?

Neutrophils are a type of white blood cell that plays a crucial role in defending your body against bacterial infections. This test measures the total number of neutrophils and, in some cases, breaks them down into different maturity stages (e.g., mature neutrophils vs. band neutrophils). The results help doctors understand if your immune system is responding normally to infections or if there may be an underlying issue.

Why Might You Need This Test?

Your doctor may order this test if you have symptoms like frequent infections, fever, fatigue, or signs of inflammation. It can also be used to monitor conditions such as leukemia, autoimmune diseases, or infections like sepsis. Sometimes, it’s part of routine blood work to check overall health.

How Is the 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 neutrophils and assess their maturity. If the test includes a differential, it may require additional processing to separate and count different neutrophil types.

What Do the Results Mean?

Results are typically reported as a count of neutrophils per microliter of blood. A high neutrophil count (neutrophilia) may suggest infection, inflammation, or other conditions like stress or certain cancers. A low count (neutropenia) could indicate immune suppression, infections, or blood disorders. Your doctor will interpret the results in relation to your symptoms and overall health.