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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 important for fighting infections and maintaining immune function.

Quick summary

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

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

Key facts at a glance

LOINC
35048-8
Short code
Lymph Abn # Snv
Synonyms
Lymph Abn # 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 Might This Test Be Done?

Your healthcare provider may order this test to evaluate your immune system, check for infections, or monitor conditions like leukemia, lymphoma, or autoimmune diseases. It can also help assess how your body responds to treatments for these conditions.

What to Expect Before the Test

No special preparation is needed. A blood sample is taken from a vein, usually in your arm, by a healthcare professional. The process is quick and typically painless.

What the Results Mean

Results show the absolute number of lymphocytes in your blood. Abnormally high or low counts may signal underlying health issues, such as infections, immune disorders, or certain cancers.

Common Conditions Monitored

This test is often used to diagnose or monitor conditions like chronic infections, immune deficiencies, blood cancers (e.g., leukemia), or inflammatory diseases.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Lymphocyte counts can help identify immune system imbalances, guide treatment decisions, and track disease progression or response to therapy. High levels may indicate overactive immune responses or infections, while low levels could suggest weakened immunity or certain cancers.

Short name

Lymphocyte Blood Count

Frequently asked questions

What causes a high lymphocyte count?
High lymphocyte counts can occur due to infections (like viral or bacterial), certain cancers (e.g., lymphoma), or immune system disorders. Chronic conditions like rheumatoid arthritis or long-term stress may also contribute.
What causes a low lymphocyte count?
Low lymphocyte counts may result from infections, chemotherapy or radiation therapy, autoimmune diseases, or conditions affecting bone marrow function. Severe stress, malnutrition, or certain medications can also lower lymphocyte levels.
Can lifestyle changes affect lymphocyte counts?
Yes, lifestyle factors like diet, sleep, and stress management can influence immune function. Maintaining a balanced diet, staying hydrated, and reducing stress may support healthy lymphocyte levels, though this test alone cannot replace medical evaluation.
  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