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Neutrophil Count in Whole Blood

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

This test measures the number of neutrophils, a type of white blood cell that helps fight infections and inflammation.

Quick summary

["Neutrophils are key defenders against bacterial infections and early indicators of immune response."]

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

Key facts at a glance

LOINC
85369-7
Short code
Neutrophils # Cont Bld FC
Synonyms
Neutrophils # Cont Bld FC
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
flow-cytometry
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 Is This Test Done?

Doctors may order a neutrophil count to diagnose or monitor conditions like infections (such as bacterial infections), inflammatory diseases, or certain blood disorders. It can also help assess how your immune system is responding to treatment.

What Does a Low or High Neutrophil Count Mean?

A low neutrophil count (neutropenia) may suggest an overactive immune response, certain medications, or conditions like leukemia or autoimmune diseases. A high neutrophil count (neutrophilia) could indicate acute infections, stress, or other inflammatory processes.

How Is This Test Performed?

A small sample of your blood is drawn from a vein, usually in your arm. The blood is then analyzed in a lab to count the number of neutrophils.

What Are Common Causes of Abnormal Neutrophil Counts?

Factors such as infections (especially bacterial), chronic illnesses, certain medications (like chemotherapy), or underlying conditions like diabetes or autoimmune disorders can affect neutrophil levels.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Neutrophil Count

Frequently asked questions

What if my neutrophil count is outside of normal ranges?
If your neutrophil count is low, your doctor may recommend further testing or adjustments to your treatment plan to prevent infections. If it’s high, they might investigate potential causes like infections or stress to tailor your care.
How often should I get this test?
The frequency depends on your medical condition and treatment. Your doctor will determine how often you need this test based on your specific situation.
Can I prepare for this test?
No special preparation is needed for this blood test. However, always inform your doctor about any medications or supplements you’re taking, as some may affect your results.
  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