Test Catalog

Test ID: CD20B    
CD20 on B Cells

Useful For Suggests clinical disorders or settings where the test may be helpful

Evaluation of CD19 deficiency in patients with a suspected CD19 deficiency (humoral immunodeficiency)


Confirming complete absence of B cells in suspected primary humoral immunodeficiencies using both CD19 and CD20 markers


Assessing therapeutic B-cell depletion quantitatively (absolute counts of cells/mcL) in any clinical context, including malignancies, autoimmune diseases such as rheumatoid arthritis, systemic lupus erythematosus, and membranous glomerulonephritis among others, and treatment or prevention of acute humoral rejection in positive crossmatch renal transplant recipients


This test is not useful for assessing whether B cells express the target molecule (CD20) in the context of initiating therapeutic monoclonal anti-CD20 antibody therapy (rituximab, ofatumumab, and tositumomab) for any of the hematological malignancies, or in other clinical contexts, such as autoimmunity, instead order CEE20 / CD20 Cell Expression Evaluation, Varies.

Method Name A short description of the method used to perform the test

Flow Cytometry

NY State Available Indicates the status of NY State approval and if the test is orderable for NY State clients.


Reporting Name Lists a shorter or abbreviated version of the Published Name for a test

CD20, B-Cells