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Test Catalog

Test ID: MSIO    
Microsatellite Instability (MSI), Tumor

Specimen Type Describes the specimen type needed for testing


Specimen Required Defines the optimal specimen. This field describes the type of specimen required to perform the test and the preferred volume to complete testing. The volume allows automated processing, fastest throughput and, when indicated, repeat or reflex testing.

Pathology report must accompany specimen in order for testing to be performed.


Tumor and normal tissue are required.


Specimen Type: Tissue block or slide

Specimen Volume: Approximately 1 cm(2) of tumor and normal tissue are required. This can be 1 cm(2) in aggregate (eg, 5 unstained slides each with 0.2 cm(2) of tumor and normal tissue).

Collection Instructions: Submit formalin-fixed, paraffin-embedded tissue block(s) with corresponding hematoxylin and eosin slides (preferred) or 1 slide stained with hematoxylin and eosin and 10 unstained, nonbaked slides (5-micron thick sections) of the tumor/normal tissue.


1. Molecular Genetics-Inherited Cancer Syndromes Patient Information Sheet (Supply T519) in Special Instructions

2. If not ordering electronically, submit a Molecular Genetics Request Form (Supply T245) with the specimen or complete, print, and send a Oncology Test Request Form (T729) with the specimen (

Reject Due To Identifies specimen types and conditions that may cause the specimen to be rejected









Specimen Stability Information Provides a description of the temperatures required to transport a specimen to the laboratory. Alternate acceptable temperature(s) are also included.

Specimen TypeTemperatureTime
VariesAmbient (preferred)