Skip to content

Lymphocyte Count (Specimen-Specific Analysis)

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 your immune system fight infections and diseases.

Quick summary

["Lymphocytes are key to your body’s defense against illness."]

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

Key facts at a glance

LOINC
107036-6
Short code
Lymphocytes # Spec FC
Synonyms
Lymphocytes # 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

What Is a Lymphocyte Count Test Used For?

Doctors may order this test to check for immune system health, diagnose conditions like infections, cancers (e.g., lymphoma), or autoimmune disorders, or monitor treatment progress in patients with chronic illnesses.

How Is the Test Performed?

A small blood sample is drawn from a vein, usually in your arm. The sample is then analyzed in a lab to count the number of lymphocytes present.

What Does the Test Result Mean?

Results may show elevated, low, or normal lymphocyte counts, each with different possible causes. Your healthcare provider will interpret the results in relation to your medical history and symptoms.

Common Conditions Linked to Lymphocyte Counts

High lymphocyte counts might indicate chronic infections, certain cancers, or immune system overactivity. Low counts could suggest infections, immune deficiencies, or conditions like leukemia.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Lymphocyte counts are critical for diagnosing and managing immune-related disorders, guiding treatment plans, and assessing overall health status in patients with chronic diseases or cancer.

Short name

Lymphocyte Count

Frequently asked questions

Why might my doctor request this test?
Your doctor may order this test to evaluate your immune system, check for signs of infection, cancer, or autoimmune diseases, or monitor how well a treatment is working.
How long does it take to get my results?
Results are typically available within 1 to 3 business days, depending on your lab’s processing time.
Can I eat or drink before this test?
No special preparation is needed for this test. However, always follow your healthcare provider’s instructions for fasting or other dietary restrictions if applicable.
  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