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Lymphocyte Count (Automated Blood Cell Differential)

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 immune defense; this test helps track their levels for health monitoring or diagnosis."]

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

Key facts at a glance

LOINC
20585-6
Short code
Lymphocytes # Spec Auto
Synonyms
Lymphocytes # Spec Auto
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
automated-count
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, immune system disorders, or conditions like leukemia, HIV, or autoimmune diseases. It can also help monitor treatment progress or side effects of medications.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or vein to draw a blood sample. The process usually takes a few minutes.

What the Results Mean

Results show your lymphocyte count in cells per microliter (µL). Low counts may indicate immune suppression, while high counts could signal infections, inflammation, or certain cancers. Your doctor will interpret results in the context of your health.

Common Conditions Linked to Lymphocyte Counts

Abnormal lymphocyte levels can signal conditions like chronic infections (e.g., tuberculosis), lymphomas, or immune deficiencies. Your doctor will discuss findings with you based on your symptoms and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

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 affecting bone marrow (e.g., chemotherapy). Lifestyle factors like poor nutrition or stress may also play a role.
How often should I get this test?
Frequency depends on your health needs. Your doctor may recommend regular testing if you have an ongoing condition (e.g., HIV, cancer) or if you’re taking treatments that affect immunity. Follow-up schedules are personalized.
Can lifestyle changes affect lymphocyte counts?
Yes. Diet, sleep, and stress management can influence immune function. Avoiding smoking, staying hydrated, and maintaining a balanced diet may support healthy lymphocyte levels, but results vary by individual.
  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