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Lymphocyte count (qualitative, automated differential blood count)

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

This test measures the number of lymphocytes, a type of white blood cell, in your blood. It helps assess your immune system’s activity and overall health.

Quick summary

["Lymphocytes are key to fighting infections and maintaining immunity."]

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

Key facts at a glance

LOINC
17227-0
Short code
Lymphocytes NFr Snv Auto
Synonyms
Lymphocytes NFr Snv Auto
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
automated-count
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may order this test to evaluate your immune system, diagnose conditions like infections, autoimmune diseases, or blood disorders, or monitor treatment responses. It’s often part of a complete blood count (CBC).

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or hand to draw blood. The process usually takes a few minutes. If you’re nervous, let your provider know—some people find it helpful to drink water beforehand or bring distractions.

What the Test Results Mean

Lymphocyte counts can vary based on age, health, and recent infections. A lower-than-normal count may suggest immune suppression, while a higher-than-normal count could indicate chronic infections, inflammation, or other conditions. Your provider will interpret results in the context of your full medical picture.

Common Conditions Linked to Lymphocyte Counts

Abnormal lymphocyte counts can signal conditions such as leukemia, HIV/AIDS, lupus, or other autoimmune diseases. They may also appear in people with chronic illnesses like cancer or severe infections. Your provider will guide you on next steps based on your results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Lymphocyte count (auto)

Frequently asked questions

How often will I need this test?
The frequency depends on your health status. Some people need it once a year, while others may have it more often if they have ongoing conditions like cancer or immune disorders. Your provider will determine the schedule based on your needs.
What if my results are outside the normal range?
If your results are abnormal, your healthcare provider will discuss them with you. They may recommend further tests, treatments, or lifestyle changes to address any underlying issues. Never interpret results alone—always talk to your provider.
Can lifestyle changes affect my lymphocyte count?
Yes, factors like diet, stress, sleep, and exercise can influence your immune system. Maintaining a balanced diet, managing stress, and getting enough rest may support healthy lymphocyte levels. However, lifestyle changes alone won’t replace medical evaluation if you have concerns.
  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