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Neutrophil Segment Count in Fluid (Absolute Neutrophil Count in Body Fluid)

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

This test measures the number of neutrophils, a type of white blood cell, in a sample of body fluid (not blood). Neutrophils help fight infections.

Quick summary

["This test helps assess inflammation or infection in body fluids like cerebrospinal fluid (CSF)."]

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

Key facts at a glance

LOINC
30452-7
Short code
Neuts Seg # Fld
Synonyms
Neuts Seg # Fld
Category
chemistry
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

Why Is This Test Done?

Your healthcare provider may order this test if you have symptoms like fever, swelling, or signs of infection in areas other than blood, such as the brain (e.g., meningitis), joints, or other tissues. It can also be used to monitor conditions affecting fluid balance or immune response in body fluids.

What Does a High or Low Neutrophil Count Mean?

A high neutrophil count in body fluid may indicate an infection, inflammation, or response to immune stimulation. A low count could suggest immune suppression, certain infections, or other systemic conditions affecting fluid or immune cells.

How Is the Sample Collected?

A sample of body fluid (e.g., cerebrospinal fluid, joint fluid, or other fluid) is collected via a needle or other medical device. The fluid is then sent to a lab for analysis.

What Are Common Conditions Monitored?

This test is often used to evaluate conditions like bacterial meningitis, abscesses, inflammatory joint diseases, or other infections in non-blood fluids. It may also help diagnose or monitor conditions affecting fluid composition or immune response.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Absolute Neutrophil Count in Body Fluid

Frequently asked questions

What does a positive or abnormal result mean?
An abnormal result (either high or low) suggests an underlying issue requiring further medical evaluation. High counts often point to infection or inflammation, while low counts may indicate immune dysfunction or other health concerns. Always discuss results with your healthcare provider.
How often should I get this test?
Your doctor will determine the frequency based on your symptoms, medical history, and treatment plan. Follow-up tests may be needed if you have ongoing health issues or symptoms.
Can I eat or drink before this test?
Generally, no special preparation is needed for this test. However, follow your healthcare provider’s instructions if the fluid sample is collected from a specific site (e.g., spinal tap). Avoiding certain medications or foods may be advised in some cases, so check with 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