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Test ID TCP T-Cell Subsets, Naive, Memory and Activated

Useful For

Determining the presence of naive, memory, and activated T cells in various clinical contexts including autoimmune diseases, immunodeficiency states, T-cell recovery posthematopoietic stem cell transplant, DiGeorge syndrome, and as a measure for T-cell immune competence


Naive T-cells results can be used as a surrogate marker for thymic-derived T-cell reconstitution, when used in conjunction with assessment of T-cell receptor excision circles (TREC / T-Cell Receptor Excision Circles [TREC] Analysis for Immune Reconstitution)


Assessing a patient's relative risk for infections


Evaluation of patients with cellular or combined primary immunodeficiencies


Evaluation of T-cell reconstitution after hematopoietic stem cell transplant, chemotherapy, biological therapy, immunosuppression or immunomodulator therapy


Evaluation of patients with autoimmune diseases


Evaluation of HIV-positive patients for naive and memory subsets


Evaluation of T-cell immune competence (presence of memory and activated T cells) in patients with recurrent infections

Method Name

Flow Cytometry

Reporting Name

T Cell Phenotyping, Advanced

Specimen Type

Whole Blood EDTA

Specimen Required

Specimens are required to be received in the laboratory weekdays and by 4 p.m. on Friday. It is recommended that specimens arrive within 24 hours of draw. Specimens arriving on the weekend may be canceled. Draw and package specimen as close to shipping time as possible.


Container/Tube: Lavender top (EDTA)

Specimen Volume: 3 mL

Collection Instructions: Send specimen in original tube. Do not aliquot.

Additional Information:

1. Ordering physician's name and phone number are required.

2. For serial monitoring, we recommend that specimen draws be performed at the same time of day.

Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time
Whole Blood EDTA Ambient 72 hours

Reference Values

The appropriate age-related reference values will be provided on the report.

Day(s) and Time(s) Performed

Monday through Friday

Do not send specimen after Thursday. Specimen must be received by 10 a.m. on Friday.

Performing Laboratory

Mayo Medical Laboratories in Rochester

CPT Code Information

86359-T cells, total count

86361-Absolute CD4 count

88184-Flow cytometry

LOINC Code Information

Test ID Test Order Name Order LOINC Value
TCP T Cell Phenotyping, Advanced In Process


Result ID Test Result Name Result LOINC Value
29151 %CD4+CD45RA+ naive T cells 13336-3
29152 %CD4+CD62L+CD27+ naive T cells In Process
29153 %CD8+CD45RA+ naive T cells In Process
29154 %CD8+CD62L+CD27+naive T cells In Process
29155 %CD4+CD45RO+ memory T cells 41994-5
29156 %CD4+CD62L+CD27+CD45RO+ (Tcm) In Process
29157 %CD4+CD62L-CD27-CD45RO+ (Tem) In Process
29158 %CD8+CD45RO+ memory T cells In Process
29159 %CD8+CD62L+CD27+CD45RO+ (Tcm) In Process
29160 %CD8+CD62L-CD27-CD45RO+ (Tem) In Process
29161 %Activated CD4 T cells (4+CD25+) 13332-2
29162 %CD4+HLA DR+CD28+ T cells In Process
29163 %CD8+HLA DR+CD28+ T cells In Process
29164 CD4+CD45RA+ naive T cells 26759-1
29165 CD4+CD62L+CD27+ naive T cells In Process
29166 CD8+CD45RA+ naive T cells In Process
29167 CD8+CD62L+CD27+naive T cells In Process
29168 CD4+CD45RO+ memory T cells 34475-4
29169 CD4+CD62L+CD27+CD45RO+ (Tcm) In Process
29170 CD4+CD62L-CD27-CD45RO+ (Tem) In Process
29171 CD8+CD45RO+ memory T cells In Process
29172 CD8+CD62L+CD27+CD45RO+ (Tcm) In Process
29173 CD8+CD62L-CD27- CD45RO+ (Tem) In Process
29174 Activated CD4 T cells (4+CD25+) 26982-9
29175 CD4+HLA DR+CD28+ T cells In Process
29176 CD8+HLA DR+CD28+ T cells In Process
29178 Interpretation 69052-9

Test Classification

This test was developed using an analyte specific reagent. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.