Neutrophil Segment Count in Peripheral Blood

What Neutrophils Do in Your Body

Neutrophils are a critical part of your immune system. They travel through your bloodstream to areas where bacteria or other harmful substances may be present. Once there, they engulf and destroy these invaders, protecting your body from infection. They also release chemicals to control inflammation, helping to heal wounds and recover from illness.

When You Might Need This Test

Doctors may order this test to check for infections, especially bacterial ones, or to evaluate conditions affecting your immune system. It can also help monitor responses to treatments for certain diseases, such as cancer or autoimmune disorders.

Common Reasons for Testing

Common reasons include diagnosing infections (like pneumonia or urinary tract infections), assessing immune function, checking for conditions like leukemia or other blood disorders, or evaluating symptoms such as fever, fatigue, or unexplained weight loss.

What to Expect Before the Test

No special preparation is usually needed. A simple blood draw from your arm is all that’s required. You may feel a slight pinch, but it’s generally quick and painless.