Neutrophil count (absolute) in serum/plasma

What Neutrophils Do in Your Body

Neutrophils are a type of white blood cell that play a critical role in your immune response. They quickly move to sites of infection or injury to destroy bacteria and other harmful substances. When your body detects an infection or inflammation, neutrophil levels often rise to help fight it off.

When This Test Might Be Ordered

Your healthcare provider may order this test if you have symptoms like fever, persistent infections, or signs of inflammation (such as swelling, redness, or pain). It’s also used to monitor conditions like chronic inflammation, autoimmune diseases, or after treatments that affect your immune system.

What to Expect Before the Test

This test is typically done by drawing blood from a vein in your arm. You may feel a slight pinch, but it usually doesn’t cause discomfort. No special preparation is needed unless your provider instructs otherwise.

How the Results Are Used

High neutrophil counts may suggest active infection, inflammation, or certain medical conditions. Low counts could indicate immune suppression, certain cancers, or blood disorders. Your provider will discuss the results in the context of your overall health and symptoms.