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Neutrophil Count in Serum or Plasma (Absolute)

Published: August 9, 2026Updated: August 17, 2026

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

Quick summary

["Neutrophils are key defenders against bacterial infections and help identify immune responses."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
48778-5
Short code
nRBC NFr CSF
Synonyms
nRBC NFr CSF
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Ref low
4.2
Ref high
5.9
Critical range
2 N/A – 7 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
85041
SNOMED
900000000000003001
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may order this test to check for infections, inflammation, or other conditions affecting your immune system. It can also help monitor treatments for conditions like leukemia or autoimmune disorders.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your arm to draw blood. If you’re on blood thinners, let your provider know before the test.

What the Results Mean

Results show the count of neutrophils in your blood. Abnormally high or low levels may signal infections, immune disorders, or other health issues. Your provider will interpret results in the context of your overall health.

Common Conditions Affecting Neutrophil Levels

High neutrophil counts may indicate infections, stress, or certain cancers. Low counts can suggest immune deficiencies, blood disorders, or medications that suppress white blood cells.

Reference range

Adult males: 4.2-5.9; Females: 3.8-5.1 x 10^12/LN/A

Specimen: csf

No special preparation required. Stay well hydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Neutrophil Count

Frequently asked questions

What causes a high neutrophil count?
Common causes include bacterial infections, stress, smoking, or certain medications. Chronic conditions like inflammatory diseases or cancers may also lead to elevated levels.
What causes a low neutrophil count?
Low neutrophil counts can result from infections, autoimmune diseases, chemotherapy, or genetic disorders. Rarely, it may be due to bone marrow disorders.
How often should I get this test?
Your provider will determine the frequency based on your health needs. Regular monitoring may be needed if you have ongoing conditions like cancer or immune disorders.
  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 17, 2026. · Read our editorial policy