Neutrophil Count (with Differential Analysis) - Peripheral Blood

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 infection and destroying harmful bacteria. High levels may suggest an active infection or inflammation, while low levels could indicate immune system issues or certain medical conditions.

How the Test Works

Blood is drawn from a vein, typically in your arm. A small sample is analyzed to count neutrophils and sometimes their subtypes (differential count). This helps healthcare providers assess immune function and identify potential health concerns.

When You Might Need This Test

Doctors may order this test to diagnose or monitor conditions like infections (e.g., pneumonia, urinary tract infections), inflammatory diseases (e.g., rheumatoid arthritis), or blood disorders. It can also be used during chemotherapy or other treatments that affect white blood cells.

Possible Results and Their Meaning

Results are usually reported as a count of neutrophils per microliter of blood. High neutrophil counts may signal infection, stress, or certain cancers. Low counts could indicate immune suppression, autoimmune diseases, or blood disorders. Always discuss results with your healthcare provider.