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T-Cell Activation Panel, Whole Blood

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

A blood test that measures markers on T lymphocytes to help evaluate immune-cell activation.

Quick summary

["This panel shows whether certain immune cells appear active, inactive, or otherwise altered."]

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

Key facts at a glance

LOINC
52765-5
Short code
TEG WO activation Pnl Bld
Synonyms
TEG WO activation Pnl Bld
Category
liver
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

What is this test?

The T-cell activation panel is a laboratory test performed on whole blood. It examines marker proteins on T cells, which are immune cells that help coordinate and control infection and other immune responses.

Why might I need this test?

This test may be ordered when a clinician is evaluating immune-system activity, unexplained immune symptoms, or the effects of medicines that alter immune responses. It may also be used as part of the assessment of immune or autoimmune disorders.

How is the test performed?

A blood sample is collected and analyzed in the laboratory, usually by flow cytometry, to identify and measure specific markers on T cells. The pattern of these markers is then used to characterize the cells' activation status.

How do I prepare for the test?

Fasting is generally not required for this test. Tell your healthcare professional if you have a recent infection, are taking immunosuppressive medicines, or have received certain treatments that may affect immune-cell markers.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

T-Cell Activation Panel

Frequently asked questions

Does this test diagnose a specific condition?
No. The panel provides information about T-cell activation and usually supports, rather than establishes, a diagnosis.
Is fasting required before the test?
Usually not, but follow any preparation instructions provided by your healthcare professional or laboratory.
Can medicines affect the results?
Yes. Immunosuppressive medicines, immune therapies, recent infections, and some other treatments can change T-cell markers.
  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