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Lymphocyte Count (Peripheral 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

["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
26482-0
Short code
Lymphocytes NFr Prt
Synonyms
Lymphocytes NFr Prt
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
86592
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 check for signs of immune system issues, such as infections, inflammatory conditions, or certain cancers. It can also help monitor treatments for conditions like leukemia or lymphoma.

What to Expect Before the Test

You may have a simple fingerstick blood draw. No special preparation is usually needed, but let your provider know about any medications or health conditions you have.

What the Results Mean

Results show the count of lymphocytes in your blood. Abnormally high or low counts may signal health concerns, but interpretation depends on your overall health and symptoms.

Common Reasons for Abnormal Results

High lymphocyte counts might indicate chronic infections, certain cancers, or immune disorders. Low counts could suggest infections, autoimmune diseases, or treatments that suppress the immune system.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Lymphocyte Count

Frequently asked questions

What causes my lymphocyte count to be different from what’s expected?
Several factors can affect your lymphocyte count, including infections, chronic illnesses, medications, or immune system disorders. Recent illnesses, stress, or even diet can also influence results.
How often should I get this test?
Your provider will determine how often you need this test based on your health needs, symptoms, or ongoing treatments. Regular monitoring may be part of managing certain conditions.
Can lifestyle changes impact my lymphocyte count?
Yes, lifestyle factors like diet, sleep, and exercise can influence your immune system. Avoiding infections, managing stress, and maintaining good hygiene may support healthier lymphocyte levels.
  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