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Lymphocyte Count (Qualitative or Quantitative Blood Analysis)

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

This test measures the number of lymphocytes in your blood, which are 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
71615-9
Short code
Lymphocytes NFr.DF Plr Manual
Synonyms
Lymphocytes NFr.DF Plr Manual
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
manual-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 recommend this test to check for immune system issues, monitor conditions like infections, autoimmune diseases, or blood disorders, or evaluate responses to treatments. It can also help diagnose or monitor certain cancers or lymphomas.

What to Expect Before the Test

No special preparation is usually needed. You may have a small needle inserted into a vein in your arm, and a small amount of blood will be drawn. This is typically done in a clinic or lab.

What the Test Results Mean

Results are qualitative (yes/no) or quantitative (exact count). A lower-than-normal lymphocyte count may suggest immune suppression, while a higher-than-normal count could indicate overactive immune responses or certain infections.

Common Conditions Monitored

Lymphocyte counts are often checked in patients with chronic illnesses like HIV/AIDS, cancer, or autoimmune diseases (e.g., lupus, rheumatoid arthritis). It can also be used to assess recovery from severe infections or treatments like chemotherapy.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Lymphocytes play a critical role in immune defense. Abnormal counts can signal underlying health issues that require further medical evaluation, such as infections, cancers, or immune system disorders.

Short name

Lymphocyte Test

Frequently asked questions

What causes a low lymphocyte count?
Low lymphocyte counts can result from infections, certain medications (like chemotherapy), autoimmune diseases, or conditions that weaken the immune system, such as HIV/AIDS or severe malnutrition.
What causes a high lymphocyte count?
High lymphocyte counts may occur with infections (like viral or bacterial), certain cancers (e.g., lymphoma), or autoimmune diseases where the immune system attacks the body. Stress or certain medications can also temporarily increase lymphocyte levels.
How often should I get this test?
The frequency depends on your health condition and treatment plan. Your doctor will determine how often to check your lymphocyte count based on your specific needs, such as monitoring chronic diseases or response to treatment.
  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