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Order Code LABKRAS2 KRAS Somatic Mutation Analysis, Tumor

Additional Codes

Mayo Test Code: KRASP
EPIC Test Code: LABKRAS2


Necessary Information


1. A pathology report (final or preliminary) is required and must accompany specimen for testing to be performed.

2. The following information must be included in the report provided.

-Patient name

-Block number-must be on all blocks, slides and paperwork (can be handwritten on the paperwork)

-Date of tissue collection

-Source of the tissue



Specimen Required


Preferred: Submit 3, if available, or 2 of the following specimens.

Acceptable: Submit at least one of the following specimens.

 

Specimen Type: Tissue block

Collection Instructions: Submit a formalin-fixed, paraffin-embedded tissue block with acceptable amount of tumor tissue.

 

Specimen Type: Tissue slide

Slides: 1 Hematoxylin and eosin-stained and 10 unstained

Collection Instructions:

Submit the followings slides:

1 Slide stained with hematoxylin and eosin

AND

10 Unstained, nonbaked slides with 5-micron thick sections of the tumor tissue.

Note: The total amount of required tumor nuclei can be obtained by scraping up to 10 slides from the same block.

Additional Information: Unused unstained slides will not be returned.

 

Specimen Type: Cytology slide (direct smears or ThinPrep)

Slides: 1 to 3 Slides

Collection Instructions: Submit 1 to 3 slides stained and coverslipped with a total of 5000 nucleated cells (preferred), or at least 3000 nucleated cells (minimum).

Note: Glass coverslips are preferred; plastic coverslips are acceptable but will result in longer turnaround times.

Additional Information: Cytology slides will not be returned.


Forms

1. Molecular Genetics: Inherited Cancer Syndromes Patient Information (T519).

2. If not ordering electronically, complete, print, and send a Oncology Test Request (T729) with the specimen.

Useful For

Detecting molecular markers associated with response or resistance to specific cancer therapies

Additional Tests

Test ID Reporting Name Available Separately Always Performed
SLIRV Slide Review in MG No, (Bill Only) Yes

Testing Algorithm

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

Method Name

Droplet Digital Polymerase Chain Reaction (ddPCR)

Reporting Name

KRAS Somatic Mutation Analysis

Specimen Type

Varies

Specimen Minimum Volume

See Specimen Required

Specimen Stability Information

Specimen Type Temperature Time
Varies Ambient (preferred)
  Refrigerated 

Reject Due To

All specimens will be evaluated at Mayo Clinic Laboratories for test suitability

Reference Values

An interpretive report will be provided.

Method Description

A pathology review and macrodissection to enrich for tumor cells is performed prior to DNA extraction.

 

Droplet digital polymerase chain reaction is used to test for the presence of KRAS codon 12, 13, 61, and 146 variants.(Unpublished Mayo method).

Day(s) Performed

Monday through Friday

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

81275-KRAS (v-Ki-ras2 Kirsten rat sarcoma viral oncogene) (eg, carcinoma) gene analysis, variants in codons 12 and 13

81276-KRAS additional variant(s)

88381-Microdissection, manual