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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, in your blood. Lymphocytes help fight infections and maintain 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
30421-2
Short code
Lymphocytes NFr Bronch
Synonyms
Lymphocytes NFr Bronch
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Might Be Ordered

Your healthcare provider may order this test to evaluate your immune system, check for infections, monitor conditions like leukemia, or assess responses to treatments. It can also help diagnose or monitor autoimmune diseases or other blood disorders.

What to Expect Before the Test

No special preparation is needed. This test is typically done by drawing blood from a vein in your arm. You may feel a slight pinch, but it usually doesn’t cause discomfort afterward.

What the Test Results Mean

Results are usually reported as a count of lymphocytes per microliter of blood. While reference ranges can vary by lab, lower than expected counts may suggest immune suppression, while higher counts could indicate infection, inflammation, or certain diseases.

Common Conditions Affecting Results

Changes in lymphocyte counts can occur with infections (like viral or bacterial), chronic illnesses (such as HIV or autoimmune diseases), or certain medications. It’s important to discuss your symptoms and any medications with your provider for accurate interpretation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Lymphocyte Count

Frequently asked questions

How often should I get this test?
The frequency depends on your health condition and treatment plan. Your healthcare provider will determine how often this test is needed based on your specific situation, such as chronic illnesses, immune therapy, or ongoing monitoring for blood disorders.
What does a low lymphocyte count mean?
A low lymphocyte count may suggest weakened immunity, possibly due to infections, certain medications, or underlying health conditions like HIV/AIDS or autoimmune diseases. It’s important to discuss symptoms and medical history with your provider for further evaluation.
Can lifestyle changes affect my lymphocyte count?
Yes, lifestyle factors like diet, stress, sleep, and exercise can influence immune function. Maintaining a balanced diet, managing stress, and getting adequate rest may support healthy lymphocyte levels, but this test alone doesn’t diagnose conditions—consult your provider for personalized advice.
  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