Skip to content

Serum Neutrophil Count (Absolute)

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

This test measures the number of neutrophils, a type of white blood cell, in your serum. Neutrophils help fight infections by attacking bacteria and other invaders in your body.

Quick summary

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

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

Key facts at a glance

LOINC
86164-1
Short code
S pneum Da 9N Ab Ser-mCnc
Synonyms
S pneum Da 9N Ab Ser-mCnc
Category
coagulation
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 Is a Neutrophil?

Neutrophils are a type of white blood cell that play a critical role in your immune response. They are the most common type of white blood cell and are essential for fighting off bacterial infections. When your body detects harmful substances, neutrophils rush to the site to destroy them.

Why Might This Test Be Ordered?

Your healthcare provider may order this test to check for infections, inflammation, or other conditions that affect neutrophil levels. It can also help diagnose or monitor conditions like leukemia, autoimmune diseases, or infections such as pneumonia or urinary tract infections.

What to Expect Before the Test

No special preparation is usually needed for this test. You may have a blood draw, where a small amount of blood is taken from a vein in your arm. If you’re on blood-thinning medication or have a history of bleeding disorders, let your provider know before the test.

What to Expect During the Test

The blood sample is collected in a tube and sent to a lab for analysis. The test typically takes a few minutes to complete, and the results are usually available within a few days.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Neutrophil Count

Frequently asked questions

What Does a High Neutrophil Count Mean?
A high neutrophil count (often called neutropenia) may indicate an active infection, such as bacterial infections, or conditions like inflammatory diseases, certain cancers, or immune disorders. It can also occur due to stress, medications, or certain medical treatments.
What Does a Low Neutrophil Count Mean?
A low neutrophil count (neutropenia) can make you more susceptible to infections. This may happen due to certain medications, blood cancers, autoimmune diseases, or genetic conditions. Severe neutropenia can be life-threatening if an infection develops.
How Often Should I Get This Test?
The frequency of this test depends on your medical condition and treatment plan. Your healthcare provider will determine how often you need it based on your symptoms, overall health, and any ongoing treatments.
  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