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Immunoassay for Lymphocyte Subset Counts (Serum/Plasma)

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

This test measures the levels of different types of white blood cells called lymphocytes in your blood, specifically T cells, B cells, and natural killer (NK) cells. These cells play key roles in your immune system.

Quick summary

["Understanding your immune cell types helps doctors assess immune function and identify potential immune disorders."]

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

Key facts at a glance

LOINC
75652-8
Short code
Imm Lymphs Bld Ql
Synonyms
Imm Lymphs Bld Ql
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What Does This Test Measure?

This test uses an immunoassay method to detect and quantify three main types of lymphocytes in your blood sample: T cells, B cells, and natural killer (NK) cells. Each type has a distinct role in fighting infections and maintaining immune balance.

Why Might You Need This Test?

Doctors may order this test to evaluate immune function, diagnose conditions like immunodeficiency, autoimmune diseases, or cancers that affect lymphocytes. It can also help monitor treatment responses in patients undergoing immunotherapy.

Sample Collection and Preparation

A blood sample is drawn from a vein, usually in your arm. The blood is processed to separate serum or plasma, which is then analyzed in a lab using an immunoassay technique to measure lymphocyte subsets.

Common Uses and Conditions

This test is commonly used in patients with suspected immune deficiencies, chronic infections, or cancers such as lymphoma or leukemia. It may also be used in research or specialized clinical settings to study immune responses.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Lymphocyte Subset Blood Count

Frequently asked questions

How long does it take to get results from this test?
Results from this test are typically available within 1 to 3 business days, depending on lab processing times and whether additional testing is required for confirmation.
What does it mean if my lymphocyte subset counts are abnormal?
Abnormal counts can signal underlying health conditions, such as an overactive or underactive immune system, infections, or certain cancers. Your healthcare provider will discuss these findings with you and may recommend further testing or treatments based on the results.
Can lifestyle factors, like diet or stress, affect lymphocyte counts?
While lifestyle factors may influence overall immune health, they generally do not directly alter lymphocyte subset counts measured in this test. However, maintaining a balanced diet and managing stress can support overall immune function.
  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