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Absolute Lymphocyte Count (from Whole Blood)

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

This test measures the number of lymphocytes, a type of white blood cell, in your blood. Lymphocytes help fight infections and are part of your immune system.

Quick summary

["Your immune health may depend on keeping lymphocyte levels balanced."]

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

Key facts at a glance

LOINC
40470-7
Short code
Lymphocytes #/area Smn HPF
Synonyms
Lymphocytes #/area Smn HPF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
microscopy-light-hpf
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Is Done

Doctors may order this test to check for infections, monitor immune function, or evaluate conditions like leukemia, HIV, or autoimmune diseases. It can also help assess how your body responds to treatments.

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.

What the Results Mean

Results show the total number of lymphocytes in your blood. Low levels may suggest immune issues, while very high levels could indicate infections or other conditions. Your doctor will interpret results in the context of your health.

Common Conditions Affecting Results

Lymphocyte counts can drop due to infections, chemotherapy, or immune disorders, and rise with chronic infections, certain cancers, or inflammatory conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Lymphocyte counts are critical for diagnosing and managing immune-related diseases. Abnormal levels can signal underlying health concerns that need further investigation, such as infections, cancers, or autoimmune disorders.

Short name

Lymphocyte Count

Frequently asked questions

What causes low lymphocyte counts?
Low lymphocyte counts can result from infections (like HIV or COVID-19), certain medications, autoimmune diseases, or conditions that weaken the immune system, such as chemotherapy or severe malnutrition.
What causes high lymphocyte counts?
High lymphocyte counts may occur with chronic infections (like tuberculosis), certain cancers (like lymphoma), or autoimmune diseases. Stress, allergies, or recent vaccinations can also temporarily increase lymphocyte numbers.
How often should I get this test?
Your doctor will determine how often to check your lymphocyte count based on your medical history, symptoms, and treatment needs. Regular monitoring may be needed if you have an ongoing health condition affecting immunity.
  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