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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. It helps assess immune function and detect conditions like infections, inflammation, or immune disorders.

Quick summary

["Lymphocytes help your body fight infections and support immune health."]

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

Key facts at a glance

LOINC
61123-6
Short code
Lymphocytes NFr Spec FC
Synonyms
Lymphocytes NFr Spec FC
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
flow-cytometry
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 an absolute lymphocyte count to evaluate your immune system. It’s often used in cases of suspected infections, autoimmune diseases, cancer, or after treatments that weaken the immune system, such as chemotherapy or organ transplants.

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, and you may feel a brief pinch. If you’re nervous, let your healthcare provider know.

What the Results Mean

Results are reported as a count of lymphocytes per microliter (µL) of blood. While reference ranges vary by lab, lower than expected counts may suggest immune suppression, while higher counts could indicate infections, allergies, or other conditions.

Common Conditions Affecting Results

Low lymphocyte counts might be linked to conditions like HIV/AIDS, certain cancers (e.g., leukemia), or treatments that suppress the immune system. High counts can signal chronic infections, inflammatory diseases, or reactive immune responses.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Absolute Lymphocyte Count

Short name

Absolute Lymphocyte Count

Frequently asked questions

How often will I need this test?
Your doctor may order this test periodically if you have an ongoing condition affecting your immune system, such as cancer treatment, HIV, or autoimmune diseases. Results are typically reviewed in the context of your overall health and symptoms.
What if my results are outside the normal range?
If your results are low, your doctor may recommend further testing or adjustments to treatments to support your immune health. If high, they might investigate potential infections or other underlying causes with additional tests.
Can lifestyle changes affect this test?
While diet and stress can influence immune function indirectly, they don’t directly alter lymphocyte counts. Focus on maintaining good hygiene and following your doctor’s advice for managing any related conditions.
  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