Test Overview

Test Methodology

Reverse transcription followed by Polymerase Chain Reaction (PCR) with detection by capillary electrophoresis.

Test Usage

Synovial sarcoma is characterized by the t(X;18)(p11;q11) translocation which occurs in over 90% of cases regardless of histologic subtype. This rearrangement leads to fusion of the SYT (SS18) gene on chromosome 18 with one of several closely related SSX genes located on the X chromosome. Approximately two-thirds of fusions are SYT/SSX1 and one-third SYT/SSX2. Other fusions are rare. Because of their high specificity and prevalence, SYT/SSX fusion transcripts are highly sensitive diagnostic markers for synovial sarcoma. Testing can aid in the differential diagnosis of synovial sarcoma, especially in tumors with unusual histologic or clinical presentations. This test qualitatively detects the SYT/SSX1 and SYT/SSX2 fusion transcripts in fresh/frozen or formalin-fixed paraffin embedded tissues.

Reference Range*

Interpretive report provided. The specific fusion transcript type is reported with a positive test result.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details

Days Test Performed

Monday - Thursday

Analytic Time

2 - 7 days

Soft Order Code


MiChart Code

SYT/SSX Translocation (Synovial Sarcoma) by PCR



Synovial Sarcoma Translocation Detection
SYTSSX Translocation Assay
SSX Xp11
SYT 18q11
SYTSSX Translocation
t(X;18) Translocation

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Molecular Diagnostics

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Specimen Requirements

Offsite Collection Instructions

A formalin-fixed, paraffin-embedded tissue block containing an area with a high percentage of neoplastic cells (for micro-/macro-dissection) is preferred. Unstained, UNBAKED slides (5-8, 10-micron slides; 10-15 if few neoplastic cells are present) with associated H&E stained slide are also acceptable. Decalcified tissue or other fixatives will be accepted and the assay attempted, however these may result in failed testing due to degraded nucleic acid. Both blocks and slides should be stored at room temperature.

Normal Volume

Formalin-fixed, paraffin-embedded tissue. Extracted RNA is also acceptable if extracted in a CLIA certified laboratory.

Additional Information

By ordering this test the clinician acknowledges that informed consent has been obtained from the patient as required by applicable state or federal laws and the ordering clinician has authorization from the patient permitting MLabs to report the test results to the ordering clinician. Test includes pathologist interpretation of results billed as a separate additional charge. This test is not available without interpretation.

Billing Information

Fee Codes

CPT Code

81401 x2



New York State Approved


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