T-Cell Activation Profile, CD8 Subsets

CPT: 86356(x3); 86359; 86360
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Test Details

Test Includes

Percentage and absolute values CD3+, CD3+CD4+, CD3+CD8+, CD3+CD25+, CD8+CD38+, CD8+HLA-DR+, CD4:CD8 ratio; CBC with differential

Use

Expanded profile for AIDS monitoring and prognosis. An increase in activation markers is associated with poor prognosis.

Limitations

This test was developed, and its performance characteristics determined, by LabCorp. It has not been cleared or approved by the US Food and Drug Administration (FDA).

Methodology

Flow cytometry

Reference Interval

Reference intervals are established by the laboratory. See table.

Adult Reference Intervals for Lymphocyte Immunophenotyping

CD

95% Confidence Interval

Percentage

Cells/mm3

Minimum

Maximum

Minimum

Maximum

CD3+

57.5

86.2

622

2402

CD3+CD4+

30.8

58.5

359

1519

CD3+CD8+

12.0

35.5

109

897

CD3+CD25+

4.9

25.9

79

535

T4:T8 ratio

0.92

3.72

CD8+CD38+

0

17.7

0

381

CD8+HLA-DR+

0

4.9

0

117

Specimen Requirements

Specimen

Whole blood

Volume

Fill tube(s) to capacity.

Container

Lavender-top (EDTA) tube and yellow-top (ACD-A) or (ACD-B) tube

Collection

Invert tube 8 to 10 times immediately after collection. To preserve cellular viability, collect specimen so it will arrive in the laboratory within 48 hours of collection. Indicate date and time of venipuncture on the tube(s) and on the test request form.

Storage Instructions

Maintain specimen at room temperature.

Stability Requirements

Temperature

Period

Room temperature

2 days

Refrigerated

Unstable

Frozen

Unstable

Freeze/thaw cycles

Unstable

Causes for Rejection

Hemolysis; specimen refrigerated or frozen; clotted specimen; contaminated specimen

Clinical Information

References

Landay AL, Jessop C, Lennette ET, Levy JA. Chronic fatigue syndrome: Clinical condition associated with immune activation. Lancet. 1991 Sep 21; 338(8769):707-712. 1679864
Sadler D, Keren DF. Surface marker assays in immunodeficiency diseases. In: Keren DF, Hanson CA, Hurtubise PE, eds. Flow Cytometry and Clinical Diseases. Chicago, Ill: ASCP Press;1994:chap 9.

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The LOINC® codes are copyright © 1994-2018, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee. Permission is granted in perpetuity, without payment of license fees or royalties, to use, copy, or distribute the LOINC® codes for any commercial or non-commercial purpose, subject to the terms under the license agreement found at https://loinc.org/license/. Additional information regarding LOINC® codes can be found at LOINC.org, including the LOINC Manual, which can be downloaded at LOINC.org/downloads/files/LOINCManual.pdf