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Immunoassay for Lymphocyte Subset Counts (Serum/Plasma)

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

This test measures specific types of white blood cells called lymphocytes in your blood, using an immunoassay method. It helps assess immune function and identify imbalances.

Quick summary

["This test helps doctors evaluate your immune system and spot potential issues with specific lymphocyte types."]

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

Key facts at a glance

LOINC
27906-7
Short code
Imm Lymphs NFr Amn
Synonyms
Imm Lymphs NFr Amn
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

What This Test Measures

The test detects and quantifies different categories of lymphocytes, including T-cells, B-cells, and natural killer (NK) cells. These cells play critical roles in your body’s immune response, helping fight infections and regulate immune reactions.

Why It’s Done

Your healthcare provider may order this test if you have symptoms like frequent infections, autoimmune conditions, or if you’re undergoing treatment that could affect your immune system, such as chemotherapy or certain medications.

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 using an immunoassay technique to detect and measure lymphocyte subsets.

Common Uses and Clinical Context

This test is often used to diagnose or monitor conditions like immunodeficiency, lymphoma, leukemia, or immune-related diseases. It can also help guide treatment decisions for patients with weakened immune systems.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Lymphocyte Subset Immunoassay

Frequently asked questions

Why might my doctor recommend this test?
Your doctor may suggest this test if you have symptoms like repeated infections, unexplained fatigue, or if you’re receiving treatments that could impact your immune system, such as chemotherapy or immunosuppressive drugs.
What do the results mean?
Results show the counts of different lymphocyte types. Low counts may suggest immunodeficiency, while high counts could indicate overactive immune responses or certain diseases. Your doctor will interpret the results in the context of your overall health and symptoms.
How often will I need this test?
The frequency depends on your health condition and treatment plan. Some patients need this test regularly, while others may only require it once or twice a year, depending on their diagnosis and management.
  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