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Neutrophil Segment Count in Blood (Absolute Neutrophil Count)

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 invaders.

Quick summary

["Neutrophils are key defenders against bacterial infections; low or high levels may signal health concerns."]

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

Key facts at a glance

LOINC
33386-4
Short code
Neuts Seg NFr Snv
Synonyms
Neuts Seg NFr Snv
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

Why This Test Matters

Neutrophils are a critical part of your immune system. They respond quickly to infections, especially bacterial ones. Measuring your neutrophil count helps doctors assess your risk for infections, especially if you have weakened immunity or certain medical conditions.

What to Expect Before the Test

No special preparation is needed for this blood test. You may have a small needle inserted into your arm to draw a blood sample. The process usually takes a few minutes, and you can resume normal activities afterward.

How the Test Results Are Used

Your doctor will compare your neutrophil count to what’s typical for healthy adults. Low levels might indicate conditions like bone marrow disorders, autoimmune diseases, or severe infections. High levels could suggest infections, inflammation, or other health issues.

Common Conditions Affecting Neutrophil Counts

Neutrophil counts can be affected by infections (such as pneumonia or urinary tract infections), chronic illnesses (like diabetes or kidney disease), or treatments (such as chemotherapy). Certain medications, stress, or even sleep deprivation can also influence these levels.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Absolute Neutrophil Count (ANC)

Frequently asked questions

What does a low neutrophil count mean?
A low neutrophil count (often called neutropenia) can increase your risk of infections, especially bacterial ones. Doctors may monitor this closely if you have a weakened immune system, recent chemotherapy, or other conditions that lower your neutrophil count.
What does a high neutrophil count mean?
A high neutrophil count may signal an active infection, inflammation, or a response to stress or illness. It can also occur in conditions like leukemia or other blood disorders. Your doctor will consider other symptoms and test results to understand the cause.
How often should I get this test?
Your doctor will determine how often you need this test based on your health condition, treatment plan, or symptoms. Regular monitoring may be needed if you have chronic illnesses, ongoing infections, or are undergoing treatments that affect your immune system.
  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