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HelpEpic Test Code LLTOT Leukemia and Lymphoma Immunophenotyping, Technical Only, Tissue
Ordering Guidance
This test is available to clients through MayoAccess or MayoLink.
This test is not intended for product of conception (POC) specimens. For POC specimens see CMAPC / Chromosomal Microarray, Autopsy, Products of Conception, or Stillbirth.
Shipping Instructions
Specimen must arrive within 4 days of collection.
Necessary Information
The following information is required:
1. Reason for testing
2. Tissue type
3. Tissue location
4. Surgical pathology case number
Specimen Required
Specimen Type: Tissue
Supplies: Hank's Solution (T132)
Container/Tube: Sterile container with 15 mL of tissue culture medium (eg, Hank's balanced salt solution, RPMI, or equivalent)
Specimen Volume: 5 mm(3) or larger biopsy
Collection Instructions:
1. Send intact specimen (do not mince).
2. Specimen cannot be fixed.
Specimen Stability Information: Ambient ≤4 days/Refrigerated ≤4 days
Forms
Useful For
Evaluation of tissues for potential involvement by:
-Chronic lymphoproliferative disorders
-Malignant lymphomas
-Acute lymphoblastic leukemia
-Acute myelogenous leukemia
Additional Tests
| Test ID | Reporting Name | Available Separately | Always Performed |
|---|---|---|---|
| FIRST | Flow Cytometry, Cell Surface, First | No, (Bill Only) | Yes |
| ADD1 | Flow Cytometry, Cell Surface, Addl | No, (Bill Only) | Yes |
Reflex Tests
| Test ID | Reporting Name | Available Separately | Always Performed |
|---|---|---|---|
| FCINT | Flow Cytometry Interp, 2-8 Markers | No, (Bill Only) | No |
| FCIMS | Flow Cytometry Interp, 9-15 Markers | No, (Bill Only) | No |
| FCINS | Flow Cytometry Interp,16 or greater | No, (Bill Only) | No |
Testing Algorithm
Note: This test is only available to clients who have MayoAccess or MayoLink.
The client is responsible for the interpretation and billing of the professional component; Mayo Clinic will bill the technical component only.
The testing process begins with a screening panel. The screening panel will be charged based on the number of markers tested (FIRST for first marker, ADD1 for each additional marker). Additional testing may be performed at an additional charge for each marker tested (ADD1, as applicable) if needed to fully characterize a disease state or clarify any abnormalities from the screening panel.
The tissue panel is initially performed to evaluate for monotypic B cells by kappa and lambda immunoglobulin light chain expression, CD5, CD10, CD19, CD20, and CD23. Increased numbers of blasts and plasma cells are identified by CD45 expression along with side scatter gating. The tissue panel also includes CD3, CD5, and CD7 antibodies to evaluate T cells. Additionally, viability is assessed on all tissue specimens using 7-AAD (7-Amino-Actinomycin D) exclusion.
This initial testing, together with the provided clinical history and morphologic review, is used to determine what, if any, additional testing is needed for disease diagnosis or classification. If additional testing is required, it will be added per algorithm to fully characterize a disease state with a charge per unique antibody tested.
Cases requiring testing for granular lymphocytic leukemia (killer-cell immunoglobulin-like receptor panel) will have an interpretation added which will be performed by a Mayo Clinic pathologist at an additional charge.
If no abnormalities are detected by the initial panel, no further flow cytometric assessment will be performed unless otherwise indicated by specific features of the clinical presentation or prior laboratory results.
Special Instructions
Method Name
Immunophenotyping
Reporting Name
Leukemia/Lymphoma; Tech Only TissueSpecimen Type
TissueSpecimen Minimum Volume
1 mm(3)
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Tissue | Refrigerated (preferred) | ||
| Ambient | |||
Reject Due To
| Fixed, paraffin-embedded, or minced tissue | Reject |
Clinical Information
Cellular immunophenotyping, characterizing cells by using antibodies directed against cell surface markers, is generally regarded as a fundamental element in establishing a diagnosis of tissue involvement by hematolymphoid malignancies when used in conjunction with morphologic assessment. It is also an essential component in subclassification of hematolymphoid malignancies when present.
This is a technical only test and does not include interpretation. At any point, clients may request to have a Mayo Clinic hematopathologist provide an interpretation at an additional charge.
Reference Values
Not applicable
Interpretation
Report will include a summary of the procedure.
Normal tissues typically contain a mixture of B cells with polytypic surface immunoglobulin light chain expression and T cells with unremarkable expression of the T cell-associated antigens CD3, CD5, and CD7. Typically, no appreciable blast population is present by CD45 and side scatter analysis.
Cautions
It is well recognized that a negative flow cytometry result does not exclude tissue involvement by hematolymphoid malignancy. This may be attributable to sampling bias, although some malignancies, such as Hodgkin lymphoma, are not detected by this technique.
Viability will be assessed in all tissue specimens. Cases in which the viability is low (<50%) are prone to false-negative results and, therefore, must be interpreted with caution. In cases with viability less than 50%, testing will be attempted but may not be interpretable. Fine-needle aspiration and small biopsy specimens have a higher frequency of low cell counts and poor viability, which may be uninterpretable.
Even when abnormal, in most instances the results of flow cytometry are insufficient for complete subclassification of a hematolymphoid malignancy. Precise subclassification requires correlation with the histopathologic features in paraffin-embedded materials and, in some instances, the results of cytogenetic analyses.
The tissue used for flow cytometry cannot be subsequently submitted for histopathologic evaluation. For this reason, this technique should be avoided in small biopsy specimens.
Day(s) Performed
Monday through Sunday
Report Available
1 to 4 daysSpecimen Retention Time
Remaining tissue: 7 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
88184-Flow cytometry; first cell surface, cytoplasmic or nuclear marker x 1
88185-Flow cytometry; additional cell surface, cytoplasmic or nuclear marker (each)
Additional CPTs may be added if consultative help is needed with the case, or algorithm dictates Mayo consultant involvement.
88187-Flow Cytometry Interpretation, 2 to 8 Markers (if appropriate)
88188-Flow Cytometry Interpretation, 9 to 15 Markers (if appropriate)
88189-Flow Cytometry Interpretation, 16 or More Markers (if appropriate)