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HelpTest Code SCTF Sex Chromosome Determination, FISH, Tissue
Reporting Name
Sex Chromosome, FISH, TsUseful For
Identifying the sex chromosome complement in paraffin-embedded tissues
Reflex Tests
| Test ID | Reporting Name | Available Separately | Always Performed |
|---|---|---|---|
| _I099 | Interphases, 25-99 | No, (Bill Only) | No |
| _I300 | Interphases, >=100 | No, (Bill Only) | No |
| _IL25 | Interphases, <25 | No, (Bill Only) | No |
| _PADD | Probe, +1 | No, (Bill Only) | No |
| _PB02 | Probe, +2 | No, (Bill Only) | No |
| _PB03 | Probe, +3 | No, (Bill Only) | No |
| _PBCT | Probe, +2 | No, (Bill Only) | No |
Testing Algorithm
This test includes a charge for application of the first probe set (2 fluorescence in situ hybridization probes) and professional interpretation of results.
Additional charges will be incurred for all reflex probes performed. Analysis charges will be incurred based on the number of cells analyzed per probe set. If no cells are available for analysis, no analysis charges will be incurred.
Appropriate ancillary probes may be performed at consultant discretion to render comprehensive assessment. Any additional probes will have the results included within the final report and will be performed at an additional charge.
Method Name
Fluorescence In Situ Hybridization (FISH)
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
TissueOrdering Guidance
This test does not include a pathology consultation. If a pathology consultation is required, order PATHC / Pathology Consultation and the appropriate fluorescence in situ hybridization (FISH) test will be ordered and performed at an additional charge.
This testing is not appropriate for distinguishing tissue from the same gender, as in a same-sex transplant or potential tissue mix-up between 2 male patients or 2 female patients.
This evaluation can be more complicated in a post-transplant neoplastic evaluation and may not produce a confirmatory result.
Shipping Instructions
Advise Express Mail or equivalent if not on courier service.
Necessary Information
1. A reason for testing and a pathology report are required in order for testing to be performed. Send information with specimen. Acceptable pathology reports include working drafts, preliminary pathology or surgical pathology reports.
2. If a transplant has been performed, provide organ (ie, bone marrow, heart, lung, kidney, etc) and gender of donor information when sending the specimen.
Specimen Required
Submit only 1 of the following specimens:
Specimen Type: Tissue
Preferred: Tissue block
Collection Instructions: Submit a formalin-fixed, paraffin-embedded (FFPE) tumor tissue block. Blocks prepared with alternative fixation methods may be acceptable; provide fixation method used.
Acceptable: Slides
Collection Instructions: Four consecutive, unstained, 5 micron-thick sections placed on positively charged slides, and 1 hematoxylin and eosin (H and E)-stained slide.
Specimen Minimum Volume
See Specimen Required
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Tissue | Ambient (preferred) | ||
| Refrigerated | |||
Reject Due To
All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.Special Instructions
Reference Values
An interpretive report will be provided.
Day(s) Performed
Monday through Sunday
CPT Code Information
88271 x 2, 88291-DNA probe, each (first probe set), Interpretation and report
88271 x 2-DNA probe, each; each additional probe set (if appropriate)
88271-DNA probe, each; coverage for sets containing 3 probes (if appropriate)
88271 x 2-DNA probe, each; coverage for sets containing 4 probes (if appropriate)
88271 x 3-DNA probe, each; coverage for sets containing 5 probes (if appropriate)
88274 w/modifier 52-Interphase in situ hybridization, <25 cells, each probe set (if appropriate)
88274-Interphase in situ hybridization, 25 to 99 cells, each probe set (if appropriate)
88275-Interphase in situ hybridization, 100 to 300 cells, each probe set (if appropriate)
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| SCTF | Sex Chromosome, FISH, Ts | 87436-2 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 52077 | Result Summary | 50397-9 |
| 52079 | Interpretation | 69965-2 |
| 52078 | Result | 87436-2 |
| CG733 | Reason for Referral | 42349-1 |
| CG734 | Specimen | 31208-2 |
| 52080 | Source | 31208-2 |
| 52081 | Tissue ID | 80398-1 |
| 52082 | Method | 85069-3 |
| 54575 | Additional Information | 48767-8 |
| 53840 | Disclaimer | 62364-5 |
| 52083 | Released By | 18771-6 |
Clinical Information
Genotypically normal females possess 2 X chromosomes (XX); genotypically normal males possess 1 X chromosome and 1 Y chromosome (XY). Determining the sex chromosome complement in a tissue specimen can be used to:
-Identify opposite sex-donor cells post-transplant
-Help resolve cases of suspected sample mix-up
Interpretation
An interpretive report will be provided.
Cautions
This test is not approved by the U.S. Food and Drug Administration and it is best used as an adjunct to existing clinical and pathologic information.
Fixatives other than formalin (eg, Prefer, Bouin's) may not be successful for FISH assays, however non-formalin-fixed samples will not be rejected.
Paraffin-embedded tissues that have been decalcified are generally unsuccessful for FISH analysis. The pathologist reviewing the hematoxylin and eosin-stained slide may find it necessary to cancel testing.
Supportive Data
Fluorescence in situ hybridization analysis was performed on a series of formalin-fixed, paraffin-embedded specimens. Specimens with known sex chromosome aneusomy were correctly identified.
Clinical Reference
1. Nakhleh RE, Zarbo RJ: Surgical pathology specimen identification and accessioning: A College of American Pathologists Q-Probes study of 1,004,115 cases from 417 institutions. Arch Pathol Lab Med. 1996 Mar;120:227-233
2. Riopel MA, Yu IT, Hruban RH, Lazenby AJ, Griffin CA, Perlman EJ: Whose tumor is this: FISHing for the answer. Mod Pathol. 1995;8:456-457
3. Valenstein PN, Raab SS, Walsh MK: Identification errors involving clinical laboratories: a College of American Pathologists Q-Probes study of patient and specimen identification errors at 120 institutions. Arch Pathol Lab Med. 2006 Aug;130(8):1106-1113
Method Description
The test is performed using a commercially available enumeration strategy probe set for the X centromere (DXZ1) and Y centromere (DYZ3). Formalin-fixed, paraffin-embedded tissues are cut at 5 microns and mounted on positively charged glass slides. The selection of tissue and the target areas on the hematoxylin and eosin (H and E)-stained slide is performed by a pathologist. Using the H and E-stained slide 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 50 interphase nuclei (100 total) with the results expressed as the percent of XX (female) or XY (male) nuclei.(Unpublished Mayo method)
Report Available
7 to 10 daysSpecimen Retention Time
Slides and H and E used for analysis are retained by the laboratory in accordance to CAP and NYS requirements. Client provided paraffin blocks and extra unstained slides (if provided) will be returned after testing is complete.Test Classification
This test was developed using an analyte specific reagent. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.Forms
New York Clients-Informed consent is required. Document on the request form or electronic order that a copy is on file. The following documents are available in Special Instructions: