EWSR1 _ 22q12 | FISH
| Test Details | Detects rearrangements of EWSR1 gene region at 22q12 |
| Relevant condition(s) | Ewing sarcoma/PNET |
| Methodology | Fluorescence in-situ hybridization |
| Performed | Monday – Friday |
| Turnaround | 3 – 5 days; STAT FISH performed within 24 – 48 hours |
| Specimen requirements | Formalin-fixed paraffin embedded tissue samples (blocks or unstained slides) |
| Sample collection | Formalin-fixed paraffin embedded tissue samples (blocks or unstained slides) |
| Minimum sample volume | Not applicable as long as tumor cells are present |
| Storage/Transport Conditions | Room temperature |
| Unacceptable Conditions | Tissue samples on un-charged microscope slides, previously stained slides (H&E, IHC, etc.) |
| CPT Code(s) | 88377 |