T-Cell Subsets, Regulatory (Tregs)
Method Description Describes how the test is performed and provides a method-specific reference
EDTA anticoagulated blood is incubated with antibodies to various T-cell markers (ie, CD4, CD127, CD45RO, CD45RA, and CD25). After RBC lysis, the sample is washed to remove any unbound antibodies prior to analysis on a BD FACS CantoA (6-color) flow cytometry instrument. The assay uses 2 antibody tubes for data acquisition, but analysis is performed as a single panel. Each Treg subset is expressed as a percentage of total CD4+ T cells. BD Tru Count tubes are used to calculate the absolute count of cells per mcL for each subset. The regulatory T-cell panel is linked to the TCD4 test (TCD4/84348 CD4 Count for Immune Monitoring, Blood) within the experiment and, therefore, the CD3, CD4, and CD8 T-cell reference ranges are provided within the TCD4 assay. The regulatory T cell results are interpreted using a reference range derived from data of normal healthy adult and pediatric donors. Isotype controls are used in each assay to measure background fluorescence of the samples. A normal, healthy control is also included in each experiment to ensure the optimal performance of the assay.(Unpublished Mayo information)
Day(s) and Time(s) Test Performed Outlines the days and times the test is performed. This field reflects the day and time the sample must be in the testing laboratory to begin the testing process and includes any specimen preparation and processing time required before the test is performed. Some tests are listed as continuously performed, which means assays are performed several times during the day.
Monday through Friday
Do not send specimen after Thursday. Specimen must be received by 10 a.m. on Friday.
Analytic Time Defines the amount of time it takes the laboratory to setup and perform the test. This is defined in number of days. The shortest interval of time expressed is "same day/1 day," which means the results may be available the same day that the sample is received in the testing laboratory. One day means results are available 1 day after the sample is received in the laboratory.
Maximum Laboratory Time Defines the maximum time from specimen receipt at Mayo Medical Laboratories until the release of the test result
Specimen Retention Time Outlines the length of time after testing that a specimen is kept in the laboratory before it is discarded
48 hours post draw
Performing Laboratory Location The location of the laboratory that performs the test