Helper T-Lymphocyte Marker CD4

Casandra

Casandra Test Code LC98394Version 1 (DRAFT)

Performing Lab

Lab LabcorpLab Test ID 505008CPT Code 86361

Helper T-Lymphocyte Marker CD4

Also known as: CD4+ Lymphocytes, T4 Helper Cells

Clinical Use

Order Test

Use

Monitor patient's helper/inducer T-cell status

Special Instructions

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.

Limitations

The test provides immunophenotyping by flow cytometry which involves detecting antigenic determinants using antigen-specific monoclonal antibodies labeled with a fluorescent dye. It's a complex technology with potential variations due to specimen handling, processing times, and storage conditions. Specimen integrity is critical for accurate results, and rejection may occur due to issues like hemolysis, clotting, or being older than 48 hours from the time of draw.

Test Details

Methodology

Cell-based / Cytometry (Flow Cytometry)

Biomarkers

CD4+ T-Lymphocytes

Protein

Absolute CD4+ • Concentration / Level • Quantitative (Continuous) (e.g., copies/mL, % expression)

Percentage of CD4+ • Concentration / Level • Quantitative (Continuous) (e.g., copies/mL, % expression)

LOINC Codes

Order Codes

65758-5

Result Codes

24467-3
8123-2
6690-2
789-8
718-7
4544-3
787-2
785-6
786-4
788-0
777-3
770-8
736-9
5905-5
713-8
706-2
75652-8
751-8
731-0
742-7
711-2
704-7
71695-1
53115-2
58413-6
18314-5
35332-6
28541-1
26498-6
19252-6
55433-7

Result Turnaround Time

1-3 days

Specimen

Whole Blood

Volume

Fill tube(s) to capacity

Minimum Volume

Not provided

Container

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

Collection Instructions

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.