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Test ID: FEWS    
Ewing Sarcoma (EWS) 22q12 Rearrangement, FISH, Tissue

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

This test uses a commercially available EWSR1 dual-color break-apart probe strategy. Formalin-fixed, paraffin-embedded tissues are cut at 5 microns and mounted on positive charged glass slides. The selection of tissue and the identification of target areas on an hematoxylin and eosin (H and E)-stained slide is performed by a pathologist. Using the H and E as a reference, target areas are etched with a diamond tipped etcher on the back of the unstained slide to be assayed. The probe set is hybridized to the appropriate target areas and 2 technologists each analyze 100 interphase nuclei each (200 total) with the results expressed as a percent abnormal nuclei.(Unpublished Mayo method)

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

No

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.

Samples processed Monday through Sunday. Results reported Monday through Friday 8am-5pm CST

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.

7 days

Maximum Laboratory Time Defines the maximum time from specimen receipt at Mayo Medical Laboratories until the release of the test result

10 days

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

Indefinitely

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

Rochester