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HelpTest Code TCD4 CD4 Count for Immune Monitoring, Blood
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
Whole Blood EDTAOrdering Guidance
For diagnosing T-lymphocytic malignancies or evaluation of T-cell lymphocytosis of unknown etiology, order LCMS / Leukemia/Lymphoma Immunophenotyping, Flow Cytometry, Varies, which includes a hematopathology review.
Shipping Instructions
It is recommended that specimens arrive within 24 hours of collection. Collect and package specimen as close to shipping time as possible.
Necessary Information
Date of collection is required.
Specimen Required
Container/Tube: Lavender top (EDTA)
Specimen Volume: 3 mL
Collection Instructions: Send whole blood specimen in original tube. Do not aliquot.
Additional Information: For serial monitoring, it is recommended that specimen collection be performed at the same time of day.
Specimen Minimum Volume
1 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Whole Blood EDTA | Ambient | 72 hours | PURPLE OR PINK TOP/EDTA |
Reference Values
The appropriate age-related reference values will be provided on the report.
Day(s) Performed
Monday through Sunday
CPT Code Information
86359-T cells, total count
86360-Absolute CD4/CD8 count with ratio
Report Available
1 to 2 daysSpecimen Retention Time
4 daysReject Due To
| Gross hemolysis | Reject |
| Gross lipemia | Reject |