Ordering Recommendation

Diagnose members of the Ewing sarcoma family of tumors (ESFT). Does not identify the translocation partner.

Mnemonic
EWSR1_FISH
Methodology

Fluorescence in situ Hybridization (FISH)

Performed

Monday-Friday

Reported

3-7 days

New York DOH Approval Status
Specimens from New York clients will be sent out to a New York DOH approved laboratory, if possible.
Specimen Required
Patient Preparation
Collect

Tumor tissue.

Specimen Preparation

Formalin fix (10 percent neutral buffered formalin) and paraffin embed tissue. Protect paraffin block from excessive heat.  Transport tissue block or 5 unstained (4-micron thick sections) positively charged slides in a tissue transport kit (ARUP supply #47808) available online through eSupply using ARUP Connect™ or contact ARUP Client Services at (800) 522-2787 (kit recommended but not necessary). (Min. 2 slides)

Storage/Transport Temperature

Room temperature. Also acceptable: Refrigerated. Ship in cooled container during summer months.

Unacceptable Conditions

Specimens fixed or processed in alternative fixatives (alcohol, Prefer) or heavy metal fixatives (B-4 or B-5). No tumor in tissue. Decalcified specimens.

Remarks

Include surgical pathology report.

Stability

Ambient: Indefinitely; Refrigerated: Indefinitely; Frozen: Unacceptable

Reference Interval
Interpretive Data

Refer to report.

Compliance Statement A: For laboratory developed tests using a manufacturer labeled ASR as the reagent providing the specificity of the assay. Analyte Specific Reagent. This test was developed and its performance characteristics determined by ARUP Laboratories. The U. S. Food and Drug Administration has not approved or cleared this test; however, the FDA has determined that such clearance or approval is not necessary.

Note
Hotline History
N/A
CPT Codes

88366

Components
Component Test Code* Component Chart Name LOINC
3000639 EWSR1 FISH Reference Number
3000640 EWSR1 FISH Source
3000641 EWSR1 FISH Result
3000702 Total Cell Count 78236-7
3000703 Scoring Method 81304-8
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
  • 22q12
  • EWSR1 FISH
  • EWSR1 Gene rearrangement
EWSR1 (22q12) Gene Rearrangement by FISH