Neutrophil count with differential (serum/plasma mass concentration)

What Neutrophils Do in Your Body

Neutrophils are a type of white blood cell that play a key role in fighting bacterial infections. They move quickly to areas of infection, where they destroy bacteria and release chemicals to control inflammation. This test helps doctors understand how well your immune system is responding to infections or other conditions that may affect neutrophils.

How the Test Works

Blood is drawn from a vein, usually in your arm. The sample is then analyzed to count neutrophils and determine their relative numbers compared to other white blood cells. The results help identify if your neutrophil count is too high or too low, which can signal different health concerns.

When You Might Need This Test

Doctors may order this test if you have symptoms like frequent infections, fever, fatigue, or if you’re recovering from surgery, chemotherapy, or a serious illness. It can also be used to monitor conditions like leukemia, autoimmune diseases, or infections.

What the Results Mean

Results are typically expressed as absolute neutrophil counts (ANC) and percentages of neutrophils among all white blood cells. High neutrophil counts may indicate infection, inflammation, or stress, while low counts can signal immune suppression, certain cancers, or blood disorders.