Neutrophil count (absolute)

What Neutrophils Do in Your Body

Neutrophils are a key part of your immune system. They travel through your bloodstream to areas where bacteria or other harmful substances may be present. When activated, neutrophils engulf and destroy invaders like bacteria. They also release chemicals to signal other immune cells to join the fight. High or low neutrophil counts can indicate different health concerns, such as infections, inflammatory conditions, or certain blood disorders.

When Might You Need This Test?

Your doctor may order this test if you have symptoms like frequent or severe infections, unexplained fever, fatigue, or signs of inflammation. It’s also used to monitor conditions like leukemia, autoimmune diseases, or after treatments that affect your immune system, such as chemotherapy.

What to Expect Before the Test

This test is usually done by taking a small blood sample from a vein in your arm. You may feel a slight pinch, but it’s quick and painless. No special preparation is needed unless your doctor instructs otherwise.

How the Results Are Used

Your results help your doctor assess your immune health. Very low neutrophil counts might suggest a condition that weakens your immune response, while very high counts could indicate infection, inflammation, or other medical issues. Your doctor will discuss the results with you in detail.