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HelpTest Code LAB342 CD4 (Helper/Inducer T-Cells)
Additional Codes
LAB342
Methodology
| Profile Information: | |
| CD4 | CD4 Absolute |
Method Name:
Flow Cytometry-Single Platform
Literature References:
1. U.S. Department of Health and Human Services, Public Health Service, CDC. Flow cytometric immunophenotyping quality assurance and quality procedures for CD4+ T-lymphocyte determinations. 04/1993.
2. NCCLS tentative guidelines. Clinical application of flow cytometry: quality assurance and immunophenotyping of peripheral blood lymphocytes. H42T 12:6.
3. MMWR Recommendation and Reports, Guidelines for performing single-platform absolute CD4 determination with CD45 gating for persons infected human immunodeficiency virus, January 21, 2003.
Performing Laboratory
Barnes-Jewish Hospital Laboratory
Specimen Requirements
Specimen must arrive within 24 hours of draw. Specimen must arrive by 1600 on Friday and 1 day before a holiday.
Specimen Type: Whole blood
Container/Tube: Lavender top (EDTA)
Specimen Volume: Full tube
Specimen Minimum Volume: 1 mL
Additional Information: Specimen cannot be refrigerated.
Specimen Transport Temperature
Ambient/Refrigerate NO/Frozen NO
Reference Values
| Helper Cells (CD4) |
|
| 0-3 Months | |
| Percentage: | 35%-64% |
| Absolute (Cells/mcL): | 1600-4000 |
| 3-6 Months | |
| Percentage: | 35%-56% |
| Absolute (Cells/mcL): | 1800-4000 |
| 6-12 Months | |
| Percentage: | 31%-56% |
| Absolute (Cells/mcL): | 1400-4300 |
| 1-2 Years | |
| Percentage: | 32%-51% |
| Absolute (Cells/mcL): | 1300-3400 |
| 2-6 Years | |
| Percentage: | 28%-47% |
| Absolute (Cells/mcL): | 700-2200 |
| 6-12 Years | |
| Percentage: | 31%-47% |
| Absolute (Cells/mcL): | 650-1500 |
| 12-17 Years | |
| Percentage: | 31%-52% |
| Absolute (Cells/mcL): | 530-1300 |
| Adult | |
| Percentage: | 31%-64% |
| Absolute (Cells/mcL): | 365-1294 |
Day(s) Test Set Up
Monday through Friday
Cut-off time: 2100 Monday through Thursday; 1600 Friday and evening before a holiday
Turnaround Time:
STAT: not available
Routine: 48 hours
Test Classification and CPT Coding
86361
Additional Information
For BJH Laboratory Use Only
Alternate Tube:
1 dark green-top (sodium heparin) tube
Analyte Stability:
Specimen cannot be refrigerated. Specimen must be processed within 72 hours of draw and kept at ambient temperature.
Laboratory Processing Instructions:
Test performed in BJH Flow Cytometry.