Test Catalog

Test ID: MSI    
Microsatellite Instability (MSI), Tumor

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

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


Evaluation through comparison of both tumor and normal 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.


See Lynch Syndrome Testing Algorithm in Special Instructions.

Special Instructions Library of PDFs including pertinent information and forms related to the 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 Available Indicates the status of NY State approval and if the test is orderable for NY State clients.


Reporting Name Lists a shorter or abbreviated version of the Published Name for a test

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)