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T-cell receptor beta gene rearrangement (T-cell clonality screening)

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

This test checks for rearrangements in the T-cell receptor beta gene, which helps identify whether your immune system is making abnormal T-cells that may indicate conditions like lymphoma or leukemia.

Quick summary

["This test helps doctors determine if your immune system has an unusual T-cell population that could signal a blood or immune disorder."]

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

Key facts at a glance

LOINC
107202-4
Short code
TCRB gene Tube B Spec
Synonyms
TCRB gene Tube B Spec
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
molgen
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

What Does This Test Measure?

The test analyzes genetic changes in T-cells by examining how their beta receptors are structured. Normally, these receptors are rearranged during immune cell development, but abnormal rearrangements can appear in certain cancers or immune disorders.

Why Might You Need This Test?

Doctors may order this test if you have symptoms like unexplained lymph node swelling, fatigue, or if you’ve been diagnosed with a suspected blood cancer or immune-related illness. It’s also used in research or monitoring certain conditions.

Sample and Procedure Details

A blood sample is typically taken from a vein in your arm. The lab processes the blood to isolate T-cells, then analyzes their genetic material for specific rearrangements using advanced molecular techniques.

What Are the Possible Results?

Results can be either positive (indicating abnormal T-cell rearrangements) or negative (showing normal genetic structure). A positive result may prompt further testing or treatment planning, while a negative result suggests no immediate concern from this test alone.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

T-cell receptor beta (TCRB) gene testing

Frequently asked questions

What Does This Test Tell Us About My Health?
A positive test for T-cell receptor beta gene rearrangements often suggests a condition like T-cell lymphoma or leukemia, where abnormal T-cells are present. However, this test alone isn’t diagnostic—it’s typically used alongside other tests to guide further evaluation.
How Does This Test Compare to Other Tests?
This test focuses on genetic changes in T-cells, unlike tests that measure protein levels or cell counts. It’s often used alongside imaging, blood counts, or other genetic tests for a fuller picture of your health status.
What If My Results Are Abnormal?
If your results show abnormal T-cell rearrangements, your healthcare provider may recommend additional tests, such as a biopsy or further genetic analysis, to determine the exact cause and next steps for 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