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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 fight infections and supports immune function.

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
35077-7
Short code
Lymph Abn NFr Fld
Synonyms
Lymph Abn NFr Fld
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
86430
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 Is This Test Done?

Your doctor may order this test to check for infections, immune system issues, or conditions like leukemia, HIV, or autoimmune diseases. It can also help monitor treatment responses in certain cancers or immune disorders.

What Does a Low or High Count Mean?

A low lymphocyte count may indicate weakened immunity, chronic illnesses, or certain medications. A high count could suggest overactive immune responses, infections, or conditions like lymphoma.

How Is This Test Performed?

A small blood sample is taken from a vein, usually in your arm. The sample is sent to a lab where it’s analyzed to count lymphocytes accurately.

What Are Common Results?

Results are typically reported as a count of lymphocytes per microliter (µL) of blood. Your doctor will compare these results to your health history and symptoms to interpret them.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Absolute Lymphocyte Count

Frequently asked questions

What causes a low lymphocyte count?
Conditions like HIV/AIDS, chemotherapy, certain medications, or chronic illnesses (e.g., diabetes, kidney disease) can lower lymphocyte counts. Stress, poor nutrition, or severe infections may also play a role.
What causes a high lymphocyte count?
Infections (like viral or bacterial), certain cancers (e.g., leukemia), autoimmune diseases, or overactive immune responses may lead to elevated lymphocyte counts. Stress or certain medications can sometimes contribute.
How often should I get this test?
Your doctor will determine how often to check this test based on your health needs, symptoms, or ongoing treatment. Regular follow-ups may be needed if you have a chronic condition or are undergoing treatment for cancer or immune disorders.
  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