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Serum or Plasma Substance Concentration (Neutrophil Count) – Quantitative

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

This test measures the amount of neutrophils, a type of white blood cell, in your blood. Neutrophils help fight infections.

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
13136-7
Short code
S pneum Da 18C Ab Ser-aCnc
Synonyms
S pneum Da 18C Ab Ser-aCnc
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 Neutrophil Count Measures

Neutrophils are a critical part of your immune system. This test helps doctors assess whether your body is responding to infections, inflammation, or other conditions that affect white blood cells.

Why It’s Ordered

Your healthcare provider may order this test if you have symptoms like frequent infections, fever, fatigue, or signs of inflammation. It can also be used to monitor conditions like leukemia, autoimmune diseases, or infections.

How the Test Works

A small blood sample is taken from a vein, usually in your arm. The sample is sent to a lab where it is analyzed to count the number of neutrophils. The result is expressed as a concentration in cells per microliter (µL).

What to Expect Before the Test

There are no special preparations needed for this test. You can eat, drink, and take your usual medications as usual. If you’re on blood thinners, let your provider know before the test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Low neutrophil counts (neutropenia) may indicate immune suppression, certain cancers, or blood disorders. High neutrophil counts (neutrophilia) can signal infections, inflammation, or stress responses. Persistent changes may require further evaluation by a healthcare provider.

Short name

Neutrophil Count

Frequently asked questions

How long will I need to wait for results?
Results are typically available within 1 to 3 business days, depending on lab processing times. Your healthcare provider will discuss the results with you during your follow-up visit.
What does a normal range mean for me?
A normal range for neutrophils is usually between 2,500 and 7,500 cells per microliter. However, what’s considered normal can vary slightly between labs and individuals. Your provider will interpret the result in the context of your overall health.
Can I do anything to affect my neutrophil count?
Certain medications, infections, or chronic illnesses can temporarily affect neutrophil levels. Stress, poor nutrition, or recent illness may also influence results. Avoiding extreme stress or infections before the test can help ensure accurate 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