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Lymphocyte Count in Whole Blood

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

This test measures the number of lymphocytes, a type of white blood cell important for fighting infections and maintaining immune function.

Quick summary

["Lymphocytes help protect your body from illness and infection."]

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

Key facts at a glance

LOINC
30413-9
Short code
Lymph Abn NFr Bld
Synonyms
Lymph Abn NFr Bld
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why Might This Test Be Ordered?

Your healthcare provider may order a lymphocyte count to evaluate your immune system, diagnose conditions like infections, autoimmune diseases, or certain cancers, or monitor treatment responses. It’s often checked alongside other blood tests to get a full picture of your health.

What Does a Lymphocyte Count Tell You?

A lymphocyte count helps determine if your immune system is functioning normally. Low counts may suggest immune deficiencies, infections, or certain cancers, while high counts could indicate chronic infections, inflammation, or overactive immune responses.

How Is This Test Performed?

A small blood sample is drawn from a vein, usually in your arm. The sample is sent to a lab where it’s analyzed to count the number of lymphocytes. This is typically done using automated blood cell counters.

What Can Affect Your Results?

Several factors can influence lymphocyte counts, including recent infections, medications (like steroids), chronic illnesses, stress, or even the timing of the blood draw. Your healthcare provider will consider these factors when interpreting your results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Lymphocyte Count

Frequently asked questions

What Are Common Questions About This Test?
Is there a normal range for lymphocyte counts? While reference ranges vary by lab, they’re used as a general guideline—not a strict rule. Your actual results will be compared to your specific lab’s standards and considered alongside other health factors.
How long does it take to get results from this test?
Results are usually available within 1 to 3 business days, depending on your lab and healthcare provider’s workflow. You’ll typically receive a call or message from your provider with the results.
Can lifestyle changes, like diet or exercise, affect lymphocyte counts?
Yes, certain lifestyle factors—such as poor nutrition, chronic stress, or smoking—may influence immune cell counts. However, lymphocyte counts are also influenced by underlying health conditions, so it’s best to discuss any changes 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