Test Catalog

Test ID: CD20B    
CD20 on B Cells, Blood

Method Description Describes how the test is performed and provides a method-specific reference

This test is performed using flow cytometry and is a single-tube, whole-blood assay incorporating CD45, CD19, and CD20 antibodies. After staining with specific antibodies, the red blood cells are lysed and the sample is analyzed by flow cytometry on a Becton Dickinson (BD) fluorescence-activated cell sorting (FACS) Canto flow cytometer. Absolute counts are obtained using BD Trucount (BD BioSciences) tubes. Both percent and absolute count will be reported for CD19 and CD20+ B cells. An absolute count will be reported for CD45.(Unpublished Mayo method)

PDF Report Indicates whether the report includes an additional document with charts, images or other enriched information


Day(s) Performed Outlines the days the test is performed. This field reflects the day that the sample must be in the testing laboratory to begin the testing process and includes any specimen preparation and processing time before the test is performed. Some tests are listed as continuously performed, which means that assays are performed multiple times during the day.

Monday through Sunday

Report Available The interval of time (receipt of sample at Mayo Clinic Laboratories to results available) taking into account standard setup days and weekends. The first day is the time that it typically takes for a result to be available. The last day is the time it might take, accounting for any necessary repeated testing.

Same day/1 to 2 days

Specimen Retention Time Outlines the length of time after testing that a specimen is kept in the laboratory before it is discarded

4 days

Performing Laboratory Location Indicates the location of the laboratory that performs the test