Neutrophil Absolute Count (Blood)
This test measures the number of neutrophils, a type of white blood cell that helps fight infections. Neutrophils are key players in your body’s immune response.
["Neutrophils help protect you from infections and inflammation—this test checks their count in your blood."]
Key facts at a glance
- LOINC
- 21418-9
- Short code
- Neutrophil Ab Ser Ql
- Synonyms
- Neutrophil Ab Ser Ql
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
What Neutrophils Do in Your Body
Neutrophils are a type of white blood cell that swarms to areas of infection or injury to destroy bacteria and other harmful invaders. They release chemicals to neutralize threats and clear debris from damaged tissues. When your body needs extra protection—such as during an infection or after surgery—neutrophil counts often rise to support healing.
Why Your Doctor Might Order This Test
Doctors may request a neutrophil count to diagnose or monitor conditions like infections (bacterial or fungal), autoimmune diseases, or blood disorders. High levels can signal infection, inflammation, or certain cancers, while low levels may indicate immune deficiencies or other health concerns.
Common Conditions Affecting Neutrophil Levels
Elevated neutrophil counts can occur with acute infections (e.g., pneumonia, urinary tract infections), chronic inflammation, or stress. Low neutrophil counts (neutropenia) may result from medications, genetic disorders, or conditions that impair bone marrow function.
How the Test Works
A small blood sample is drawn, and your white blood cells are analyzed under a microscope or via automated testing. Neutrophils are counted based on their distinct appearance and function in your bloodstream.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
Neutrophil Count
Frequently asked questions
How often do neutrophil counts change during recovery from an infection?
Can diet or supplements affect neutrophil counts?
What should I do if my neutrophil count is unusually high or low?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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