Test Name: CD19
Methodology: Flow Cytometry
Staining for CD19 detects normal mature and immature B-cells at all stages of maturation, and most normal plasma cells. CD19 is also expressed in most mature B-cell non-Hodgkin lymphomas, precursor B-cell lymphoblastic lymphoma/leukemia and by the myeloblasts of some acute myeloid leukemias [most characteristically, AML with t(8;21)]. The loss of CD19 expression is a part of the abnormal immunophenotype of a large proportion of plasma cell neoplasms (including MGUS and myeloma).
Testing for this antigen is typically performed as a part of the leukemia/lymphoma screening panel. For customized testing panels including this antigen, please contact the Medical Director of the Flow Cytometry laboratory.
Storage and Transport
Maintain specimen at room temperature. Do not refrigerate or freeze. Use cold pack for transport, making sure cold pack is not in direct contact with specimen.
Specimen Rejection Criteria
Turn Around Time (TAT): 24 hours
CPT Codes*: 88184, 88185, 88187, 88188, 88189
*The CPT codes provided with our Test Descriptions are based on AMA guidelines and are for informational purposes only. Correct CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed.