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Neutrophil-to-Lymphocyte Ratio (NLR) via Probe Measurement (Qualitative)

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

This test measures the ratio of neutrophils to lymphocytes in your blood, often used to assess immune response or inflammation.

Quick summary

["Neutrophils and lymphocytes are key white blood cells; their balance can signal health or disease."]

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

Key facts at a glance

LOINC
74534-9
Short code
N men sg Y DNA Spec Ql NAA+probe
Synonyms
N men sg Y DNA Spec Ql NAA+probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
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 This Test Measures

Neutrophils are a type of white blood cell that fight infections, while lymphocytes help with immune responses. This test compares their counts to identify shifts that may indicate conditions like infection, inflammation, or certain cancers.

Why It’s Done

Your doctor may order this test to evaluate immune function, monitor chronic conditions (e.g., cancer, autoimmune diseases), or assess response to treatment. It’s sometimes used alongside other blood tests for a fuller picture.

How It Works

A small blood sample is taken, and a specialized probe analyzes the cell counts. Unlike traditional lab tests, this method provides a qualitative (yes/no) result for the ratio rather than exact numbers.

What to Expect

You’ll likely have a quick, painless blood draw. Results may be available the same day or within a few hours, depending on lab processes. Follow-up may involve additional tests or discussions with your provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

NLR Probe

Frequently asked questions

How elevated or low NLR might be interpreted depends on your overall health and symptoms. High NLR could suggest infection, stress, or inflammation, while low NLR might indicate immune suppression or certain cancers. Always discuss results with your doctor.
This test is not a standalone diagnosis. It’s often used alongside other tests (e.g., complete blood count) to guide treatment decisions.
What does a high or low NLR mean for me?
Your doctor will consider your symptoms, medical history, and other test results to explain what the NLR suggests. For example, a high NLR might mean your body is overreacting to infection, while a low NLR could signal weakened immunity.
Can I avoid this test if I have no symptoms?
Not always. Your doctor may order it as part of routine monitoring, screening, or to investigate unexplained symptoms. Ask if this test is necessary for your situation.
  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