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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. Lymphocytes help fight infections and are part of your immune system.

Quick summary

["Your absolute lymphocyte count helps doctors assess your immune function."]

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

Key facts at a glance

LOINC
106918-6
Short code
Lymphocytes NFr BAL
Synonyms
Lymphocytes NFr BAL
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 Is Done

Doctors may order an absolute lymphocyte count to evaluate your immune system, especially if you have symptoms like frequent infections, fatigue, or unexplained weight loss. It can also be used to monitor conditions like cancer, HIV, or autoimmune diseases.

What to Expect Before the Test

No special preparation is needed for this blood test. You may have a small needle inserted into your arm to draw a blood sample, similar to other routine blood tests.

What the Results Mean

Results are reported as a count of lymphocytes per microliter (µL) of blood. Lower than expected counts may indicate immune suppression, while higher counts could suggest infection, inflammation, or certain blood disorders.

Common Conditions Monitored

This test is often used to monitor people with weakened immune systems, such as those undergoing chemotherapy, living with HIV/AIDS, or taking medications that suppress the immune response.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Absolute Lymphocyte Count

Frequently asked questions

What does an abnormal lymphocyte count mean?
An abnormal count could signal an immune system that’s too active (e.g., infections, inflammation) or too weak (e.g., after chemotherapy, HIV, or certain medications). Your doctor will discuss results in the context of your health history.
How often should I get this test?
Frequency depends on your medical condition. Doctors may recommend regular checks if you have a chronic illness, are undergoing treatment for cancer or HIV, or have a history of immune-related issues.
Can lifestyle changes affect lymphocyte counts?
Yes, stress, poor sleep, diet, and smoking can influence immune function. Maintaining a balanced lifestyle may support your immune system, but results depend on your overall health and treatment.
  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