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Neutrophil Segment Count in Fluid (e.g., Blood or Body Fluid)

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

This test measures the number of mature neutrophils, a type of white blood cell, in a fluid sample, such as blood or another bodily fluid.

Quick summary

["Neutrophils help fight infections and inflammation; this test helps assess immune response or potential bleeding/fluid issues."]

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

Key facts at a glance

LOINC
30453-5
Short code
Neuts Seg NFr Fld
Synonyms
Neuts Seg NFr Fld
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
86430
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

Why Is This Test Done?

Doctors may order this test to evaluate immune function, detect infections, assess bleeding disorders, or monitor conditions affecting white blood cells, such as certain cancers or inflammatory diseases. It can also help diagnose conditions like sepsis or blood disorders.

What Does a High or Low Neutrophil Count Mean?

Elevated neutrophil counts may indicate acute infections, inflammation, or stress. Low counts could signal immune suppression, certain cancers, or blood disorders. However, results depend on the context of your symptoms and medical history.

Sample Collection and Preparation

A blood sample or other fluid (e.g., from a wound or body cavity) is collected via a needle or other method. The fluid is then processed in the lab to count neutrophils under a microscope or using automated technology.

Common Conditions Monitored

This test is often used alongside other blood tests to diagnose or monitor conditions like leukemia, severe infections, autoimmune diseases, or bleeding disorders. It may also guide treatment decisions for conditions affecting white blood cells.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Neutrophil Segment Count

Frequently asked questions

What might cause abnormal results?
Abnormal neutrophil counts can result from infections (bacterial, not viral), chronic inflammation, stress (e.g., surgery, trauma), or certain medications. Low counts may occur with immune deficiencies, chemotherapy, or autoimmune diseases. Always discuss results with your healthcare provider.
How soon will I get results?
Results are typically available within 1–2 business days, depending on lab processing times. Your doctor will explain what the numbers mean in relation to your health.
Can I prepare for this test?
No special preparation is needed for most cases. If you’re taking blood-thinning medications, inform your lab staff to avoid complications. Avoid heavy meals or strenuous activity before the test if instructed by your provider.
  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