MSI - Overview: Microsatellite Instability (MSI), Tumor

Test Catalog

Test Name

Test ID: MSI    
Microsatellite Instability (MSI), Tumor

Useful For Suggests clinical disorders or settings where the test may be helpful

Evaluation of tumor tissue to identify patients at high risk for having hereditary nonpolyposis colorectal cancer (HNPCC)/Lynch syndrome


Evaluation of tumor tissue for clinical decision making purposes given the prognostic implications associated with MSI phenotypes

Genetics Test Information Provides information that may help with selection of the correct genetic test or proper submission of the test request

Only microsatellite instability (MSI) testing is performed.

Additional Tests Lists tests that are always performed, at an additional charge, with the initial tests

Test IDReporting NameAvailable SeparatelyAlways Performed
SLIRVSlide Review in MGNo, (Bill Only)Yes

Testing Algorithm Delineates situations when tests are added to the initial order. This includes reflex and additional tests.

When this test is ordered, slide review will always be performed at an additional charge.

Special Instructions and Forms Library of PDFs including pertinent information and consent forms, specimen collection and preparation information, test algorithms, and other information pertinent to test

Method Name A short description of the method used to perform the test

A polymerase chain reaction (PCR)-based assay is used to test for tumor microsatellite instability with the use of 5 mononucleotide repeats.

NY State Approved Indicates the status of NY State approval and if the test is orderable for NY State clients.


Reporting Name A shorter or abbreviated version of the Published Name for a test; an abbreviated test name

Microsatellite Instability, Tumor

Aliases Lists additional common names for a test, as an aid in searching

DNA Mismatch Repair-related HNPCC
Hereditary Nonpolyposis Colon Cancer (HNPCC)
Lynch Syndrome
Microsatellite Instability (MSI)
Tumor Microsatellite Instability (MSI)