Neutrophil Segment Count in Whole Blood
This test measures the proportion of neutrophils, a type of white blood cell, in your blood sample. Neutrophils help fight infections by attacking bacteria and other invaders.
["Understanding your neutrophil percentage can help identify infections or immune responses."]
Key facts at a glance
- LOINC
- 30450-1
- Short code
- Neuts Hyperseg NFr Bld
- Synonyms
- Neuts Hyperseg NFr Bld
- Category
- chemistry
- Sample
- whole-blood
- Container
- Lavender-top (EDTA)
- Units
- N/A
- Ref low
- 0.4
- Ref high
- 4
- Critical range
- 0.1 N/A – 20 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 84443
- SNOMED
- 301343003
- Specimen volume
- 3 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 4–24 hours
- Order
- routine
What Neutrophil Percentage Measures
Neutrophils are a key part of your immune system. This test looks at what percentage of your total white blood cells are neutrophils. The result helps doctors assess whether you have an infection, inflammation, or other conditions affecting your immune response.
Why It Matters in Diagnosis
High neutrophil counts may suggest bacterial infections, stress, or inflammatory conditions. Low counts could indicate immune disorders, certain cancers, or severe infections like sepsis. Your doctor will use these results alongside other tests and symptoms to guide treatment.
Common Conditions Affecting Neutrophil Levels
Conditions like chronic infections, autoimmune diseases, or certain cancers can influence neutrophil levels. Neutrophil counts may also change with medications, trauma, or severe illness.
Sample Preparation and Testing Process
This test uses a small sample of your whole blood, typically drawn from a vein. The blood is analyzed in a lab using automated technology to count and identify different white blood cell types, including neutrophils.
Reference range
Adult: 0.4-4.0 mIU/LN/A
Take your thyroid medication after the blood draw if applicable. No fasting required.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Neutrophil percentage is critical for diagnosing infections, especially bacterial ones, and monitoring immune function. Elevated levels may prompt further investigation into infections or inflammatory processes, while low levels could signal underlying immune deficiencies or severe illness. Your doctor will interpret results in the context of your overall health and symptoms.
Short name
Neutrophil Percentage
Frequently asked questions
How long does it take to get results from this test?
Can diet or medications affect neutrophil counts?
When might my doctor order this test?
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