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Evaluating lymphocytoses of undetermined etiology
Identifying B- and T-cell lymphoproliferative disorders involving blood and bone marrow
Distinguishing acute lymphoblastic leukemia (ALL) from acute myeloid leukemia (AML)
Immunologic subtyping of ALL
Distinguishing reactive lymphocytes and lymphoid hyperplasia from malignant lymphoma
Distinguishing between malignant lymphoma and acute leukemia
Phenotypic subclassification of B- and T-cell chronic lymphoproliferative disorders, including chronic lymphocytic leukemia, mantle cell lymphoma, and hairy cell leukemia
Recognizing AML with minimal morphologic or cytochemical evidence of differentiation
Recognizing monoclonal plasma cells
When a blood, bone marrow, or fluid test is ordered, a screening panel and a professional interpretation will always be charged. The screening panel will be charged based on number of markers tested (FIRST for first marker, ADD1 for each additional marker). The interpretation will be based on markers tested in increments of 2 to 8, 9 to 15, or 16 and greater. In addition, reflex testing may occur to fully characterize a disease state or clarify any abnormalities from the screening test. Reflex tests will be performed at an additional charge (ADD1) for each marker tested.
The triage panel is initially performed to evaluate for monotypic B cells by kappa and lambda light chain expression, increased numbers of blast cells by CD34 and CD45 expression along with side scatter gating, and increased plasma cells by CD45 expression and side scatter gating. The triage panel also includes antibodies to assess the number of CD3-positive T cells and CD16-positive/CD3-negative natural killer (NK) cells present. This triage panel also determines if there is an increase in the number of T cells that aberrantly coexpress CD16, an immunophenotypic feature of T-cell granular lymphocytic leukemia.
This panel, 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.
This test (LCMS) is not appropriate for bone marrow specimens being evaluated for possible involvement by a myelodysplastic syndrome (MDS) or a myelodysplastic/myeloproliferative neoplasm (MDS/MPN), including chronic myelomonocytic leukemia (CMML); in that situation, MYEFL / Myelodysplastic Syndrome by Flow Cytometry, Bone Marrow should be ordered.
In addition to reflexing flow cytometric panels, other studies may be added to facilitate diagnosis.
Cytogenetic FISH Studies:
-CCND1/IGH translocation t(11;14), to exclude mantle cell lymphoma in cases of CD5+CD23- B-cell lymphoproliferative disorder.
-PML-RARA translocation t(15;17), to exclude acute promyelocytic leukemia if there is morphologic suspicion and/or blasts and promyelocytes are CD34 and HLA-DR-negative.
-TCL-1 break-apart at 14q32, to exclude T-cell prolymphocytic leukemia in cases with CD4-positive T-cell lymphoproliferative disorder (phenotypic aberrancy or very tight CD4+ population with high CD4:CD8 ratio).
-MYC break-apart at 8q24, with or without IGH-BCL2 t(14;18) and BCL6 break-apart at 3q27, for suspected high grade B-cell lymphomas, based on morphologic assessment and immunophenotype (usually CD10-positive).
Molecular Genetic Studies:
-T-cell receptor gene rearrangement to examine clonality of T cells in cases showing phenotypically aberrant T-cell population.
-Tartrate-resistant acid phosphatase (TRAP) stain to confirm hairy cell leukemia.
Note: FISH or molecular testing may be recommended by the Mayo pathologist in some cases. They will contact the referring physician or pathologist to confirm the addition of these tests.
The following algorithms are available in Special Instructions:
-Malignant Lymphoma, Guideline for Bone Marrow Staging Studies
-Acute Promyelocytic Leukemia: Guideline to Diagnosis and Follow-up
Diagnostic hematopathology has become an increasingly complex subspecialty, particularly with neoplastic disorders of blood and bone marrow. While morphologic assessment of blood smears, bone marrow smears, and tissue sections remains the cornerstone of lymphoma and leukemia diagnosis and classification, immunophenotyping is a very valuable and important complementary tool.
Immunophenotyping hematopoietic specimens can help resolve many differential diagnostic problems posed by the clinical or morphologic features.
This test is appropriate for hematopoietic specimens only. If your specimen is a solid tissue, order LLPT / Leukemia/Lymphoma Immunophenotyping by Flow Cytometry, Tissue.
An interpretive report will be provided.
This test will be processed as a laboratory consultation. An interpretation of the immunophenotypic findings and correlation with the morphologic features will be provided by a hematopathologist for every case.
Report will include a morphologic description, a summary of the procedure, the percent positivity of selected antigens, and an interpretive conclusion based on the correlation of the clinical history with the morphologic features and immunophenotypic results.
Specimens will be initially triaged to determine which, if any, of the immunophenotyping panels should be performed.
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