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Lymphocyte Count in Blood (Absolute)

Published: August 9, 2026Updated: August 16, 2026

This test measures the number of lymphocytes, a type of white blood cell that helps your immune system fight infections and diseases.

Quick summary

["Lymphocytes help protect your body by identifying and attacking harmful invaders like viruses and bacteria."]

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

Key facts at a glance

LOINC
35046-2
Short code
Lymph Abn # Fld
Synonyms
Lymph Abn # Fld
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 doctor may recommend this test if you have symptoms like frequent infections, fatigue, or unexplained weight loss. It can also be used to monitor conditions such as immune disorders, certain cancers, or after treatments like chemotherapy.

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 a blood sample. The process usually takes a few minutes, and you may feel a slight pinch or discomfort.

What the Test Results Mean

Results are typically reported as the number of lymphocytes per microliter (µL) of blood. Low levels may indicate immune suppression, while high levels could suggest infections, inflammation, or certain diseases.

Common Conditions Affecting Results

Changes in lymphocyte count can occur with infections, autoimmune diseases (like lupus or rheumatoid arthritis), or after treatments that weaken the immune system.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Lymphocyte counts are crucial for diagnosing and managing immune-related conditions, guiding treatment decisions, and assessing recovery from illnesses or therapies.

Short name

Lymphocyte Count

Frequently asked questions

What causes a low lymphocyte count?
Low lymphocyte counts can result from infections, certain medications, autoimmune diseases, or conditions that affect the bone marrow (like leukemia). Chronic stress or poor nutrition may also play a role.
What causes a high lymphocyte count?
High lymphocyte counts are often seen in infections (like viral or bacterial), certain cancers (such as lymphoma), or inflammatory conditions. Stress or certain medications can also temporarily increase lymphocyte levels.
How often should I get this test?
Your doctor will determine the frequency based on your health condition, treatment plan, or symptoms. Regular monitoring may be needed if you have an ongoing medical issue affecting your immune system.
  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