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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 blood. Neutrophils help fight infections.

Quick summary

["Your blood test helps doctors check if you have an infection or inflammation."]

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

Key facts at a glance

LOINC
770-8
Short code
Neutrophils NFr Bld Auto
Synonyms
Neutrophils NFr Bld Auto
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
automated-count
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 this test to diagnose infections (like bacterial infections), monitor chronic conditions (such as certain cancers or autoimmune diseases), or check for signs of inflammation in your body. It can also help evaluate how well your immune system is responding to treatment.

What does a high or low neutrophil count mean?

A high neutrophil count may indicate an active infection, inflammation, or other conditions like leukemia. A low neutrophil count (neutropenia) can make you more susceptible to infections, especially if it lasts for a long time or is severe.

How is this test performed?

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

What should you do before the test?

No special preparation is needed for this test. However, if you are taking certain medications that affect your immune system, your doctor may advise you to stop them temporarily or consult them before the test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is crucial for assessing immune function and detecting infections or inflammatory conditions. It helps guide treatment decisions and monitor the effectiveness of therapies.

Short name

Neutrophil Absolute Count (NAC)

Frequently asked questions

Will I feel any pain or discomfort during the test?
You may feel a slight pinch when the needle is inserted, but the procedure usually takes only a few minutes. Most people experience minimal discomfort afterward.
How long will it take to get the results?
Results are typically available within a few days, depending on your lab’s processing schedule.
Can I eat or drink before this test?
You can eat and drink normally before this test unless your doctor has specific instructions otherwise.
  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