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Neutrophil Absolute Count (Serum/Plasma)

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

["Neutrophils are key defenders against bacterial infections and inflammation."]

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

Key facts at a glance

LOINC
73075-4
Short code
Drug (neut) Ab SerPl FC-Imp
Synonyms
Drug (neut) Ab SerPl FC-Imp
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
flow-cytometry
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 Neutrophils Do in Your Body

Neutrophils are a critical part of your immune system. They’re the most abundant type of white blood cell and play a major role in fighting off bacterial infections. When you have an infection or inflammation, your body produces more neutrophils to help clear the threat. High levels may indicate an active infection, while low levels could suggest immune issues or certain medical conditions.

When This Test Might Be Ordered

Your doctor may order this test if you have symptoms like frequent infections, fever, or signs of inflammation. It’s also used to monitor conditions like leukemia, autoimmune diseases, or after treatments that affect your immune system.

How the Test Works

A small blood sample is drawn, and the neutrophils are counted using a specialized blood analyzer. The test measures the absolute number of neutrophils per microliter of blood.

What to Expect Before the Test

There are usually no special preparations needed. You can eat and drink normally on the day of the test. If you’re on blood-thinning medications, let your doctor know before the test.

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 means your body is responding to an infection, inflammation, or stress. It can also occur with certain medical conditions like cancer or autoimmune disorders. Your doctor will consider your symptoms and overall health when interpreting the results.
What does a low neutrophil count mean?
Low neutrophil counts can indicate a weakened immune system, infections, or side effects of certain medications. Conditions like leukemia, HIV, or chemotherapy can also lead to low neutrophil levels. Your doctor will review your medical history and other 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 and treatment plan. Regular monitoring may be needed if you have chronic illnesses 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