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Neutrophil count (absolute)

Published: August 9, 2026Updated: August 16, 2026

This test measures the number of neutrophils, a type of white blood cell, in your blood. Neutrophils help fight infections by attacking bacteria and other harmful substances.

Quick summary

["Neutrophils are key defenders against infections; their count helps doctors assess your immune response."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
13516-0
Short code
Neutrophils NFr CSF Manual
Synonyms
Neutrophils NFr CSF Manual
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
manual-count
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why This Test Is Done

Doctors may order this test to check for infections, such as bacterial infections, or to evaluate conditions like chronic inflammation, autoimmune diseases, or certain cancers. It can also help monitor treatment effectiveness for conditions like leukemia or other blood disorders.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your arm to draw blood. If you’re nervous, let your healthcare provider know so they can help make it more comfortable.

What the Results Mean

Results are usually reported as a specific number of neutrophils per microliter (µL) of blood. High neutrophil counts may indicate infection or inflammation, while very low counts could suggest immune system issues or certain medications.

Common Conditions Monitored

This test is often used alongside other blood tests to diagnose or track conditions like appendicitis, abscesses, or infections caused by bacteria. It can also help identify conditions where neutrophils are unusually high or low, such as in neutropenia or severe infections.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Neutrophils play a critical role in the body’s immune response. Elevated levels often signal active infection or inflammation, while decreased levels may point to immune deficiencies, certain cancers, or side effects of medications. Always discuss results with your healthcare provider.

Short name

Neutrophil WBC differential

Frequently asked questions

What does a high neutrophil count mean?
A high neutrophil count may suggest an active bacterial infection, inflammation, or stress responses like severe illness or trauma. Your doctor will consider your full medical picture to interpret results accurately.
Can diet affect neutrophil counts?
Diet can indirectly influence immune health, but it rarely affects neutrophil counts directly. Focus on a balanced diet to support overall immune function, but avoid assuming specific foods will alter test results.
How often should I get this test?
Frequency depends on your health condition. Doctors may recommend this test periodically if you have chronic illnesses, undergo treatment for infections, or are at higher risk for certain conditions. Follow your provider’s guidance.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy