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Lymphocyte Count (Absolute)

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

This test measures the number of lymphocytes, a type of white blood cell that helps fight infections and supports immune function.

Quick summary

["Lymphocytes help protect your body from illness; this test helps assess your immune health."]

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

Key facts at a glance

LOINC
26483-8
Short code
Lymphocytes NFr Snv
Synonyms
Lymphocytes NFr Snv
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

Why This Test Is Done

Doctors may order a lymphocyte count to evaluate immune function, diagnose conditions like infections, autoimmune diseases, or blood disorders, or monitor treatment responses. It can also be part of routine blood work or during cancer screening.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or vein to draw blood. The process takes about 5 minutes, and you may feel a brief pinch or slight discomfort.

What the Results Mean

Results are typically reported as a count of lymphocytes per microliter (µL) of blood. Low counts may indicate immune suppression, high counts could suggest infection, inflammation, or certain cancers. Your doctor will interpret results in the context of your overall health.

Common Conditions Affecting Results

Lymphocyte levels can be affected by infections (like viruses or bacteria), chronic illnesses (such as HIV or lupus), cancer treatments, or certain medications. Stress, sleep deprivation, or recent illness can also temporarily alter counts.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormally low lymphocyte counts may signal weakened immunity, increasing susceptibility to infections. Elevated counts can indicate overactive immune responses, chronic inflammation, or underlying diseases like leukemia. Regular monitoring helps track immune health and treatment effectiveness.

Short name

Lymphocyte Count

Frequently asked questions

What causes low lymphocyte counts?
Low lymphocyte counts can result from infections (e.g., HIV), autoimmune diseases, chemotherapy, or certain medications. It may also occur in people with chronic illnesses or those undergoing stress or poor nutrition.
What causes high lymphocyte counts?
High lymphocyte counts can be due to infections (e.g., viral), chronic inflammation, or certain cancers (e.g., lymphoma). Stress, sleep disorders, or immune system overreactions may also contribute.
Can lifestyle changes affect lymphocyte counts?
Yes, lifestyle factors like diet, sleep, and stress can influence immune function. Maintaining a balanced diet, managing stress, and getting enough rest may support normal lymphocyte levels, though results depend on overall health.
  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