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Neutrophil Segment Count in Whole Blood

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 and inflammation.

Quick summary

["Neutrophils are key defenders against bacterial infections and help manage inflammation in your body."]

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

Key facts at a glance

LOINC
26505-8
Short code
Neuts Seg NFr Bld
Synonyms
Neuts Seg NFr Bld
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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

Why Might This Test Be Done?

Your healthcare provider may order this test to check for infections, inflammation, or other conditions that affect your immune system. It can also help monitor certain treatments or conditions like autoimmune diseases or blood disorders.

What to Expect Before the Test

No special preparation is needed for this test. You may have a small needle inserted into your arm or vein to draw a blood sample. The process is quick and usually painless.

What the Results Mean

Results are typically reported as the absolute count of neutrophils per microliter (µL) of blood. Abnormally high or low counts may signal underlying health issues that need further evaluation.

Common Conditions Affecting Neutrophil Counts

High neutrophil counts can indicate infections, stress, or certain inflammatory conditions. Low counts may suggest immune deficiencies, infections, or medications that suppress the bone marrow.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Neutrophil Count

Frequently asked questions

What causes a high neutrophil count?
High neutrophil counts can be due to infections (especially bacterial), stress, smoking, or certain medications. Chronic conditions like inflammatory bowel disease or autoimmune disorders may also contribute.
What causes a low neutrophil count?
Low neutrophil counts can result from infections, autoimmune diseases, certain medications (like chemotherapy), or bone marrow disorders. Severe cases may require immediate medical attention.
How often should I get this test?
The frequency depends on your health status and reasons for testing. Your healthcare provider will determine how often this test should be done based on your specific situation.
  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