Neutrophil count (absolute) in whole blood

Your doctor may order this test as part of a complete blood count (CBC) to check how well your immune system is working, to help find the cause of a fever or suspected infection, or to monitor conditions and treatments, such as chemotherapy, that can affect your white blood cells.

Your healthcare provider may order this test to check for infections, especially bacterial ones, or to evaluate conditions affecting your immune system, such as chronic infections, autoimmune diseases, or certain cancers. It’s also used to monitor treatment responses in patients receiving chemotherapy or other immune-suppressing therapies.

This test usually requires no special preparation, and you can generally eat and drink as usual beforehand. Tell your doctor about all medicines, vitamins, or supplements you take, because some drugs can change your neutrophil levels. A small blood sample will be drawn from a vein in your arm.

No special preparation is needed for this test. It’s typically done by taking a small blood sample from a vein in your arm. The process is quick and usually painless, though you might feel a slight pinch. If you’re on blood thinners or have a history of bleeding issues, let your provider know before the test.

Normal results mean your neutrophil count falls within the expected range. A high count may suggest an infection, inflammation, or physical stress, while a low count can make it harder for your body to fight infections. Your doctor will interpret your numbers along with your symptoms and medical history.

Results are reported as the number of neutrophils per microliter (µL) of blood. While specific reference ranges vary by lab, lower than expected counts may indicate neutropenia (a low neutrophil level), which can increase susceptibility to infections. Higher-than-normal counts might suggest inflammation, infection, or other conditions.

Bacterial infections often raise neutrophil levels, while viral illnesses, certain medications, autoimmune disorders, and bone marrow problems can lower them. Chronic inflammation, smoking, severe stress, and some cancers may also affect your counts. Always review your results with your doctor to understand what they mean for you.

Neutrophil counts can be affected by infections (like pneumonia or urinary tract infections), inflammatory diseases (such as rheumatoid arthritis), certain medications (like chemotherapy drugs), or underlying conditions like leukemia or autoimmune disorders. Chronic neutropenia, where neutrophils remain low over time, may require further investigation.