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Test Code MGMTD MGMT Promoter Methylation Analysis, Tumor


Necessary Information


A pathology report (final or preliminary), containing the following information, is required and must accompany specimen for testing to be performed:

1. Patient name

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

3. Tissue collection date

4. Source of the tissue



Specimen Required


This assay requires at least 20% tumor nuclei.

-Preferred amount of tumor area with sufficient percent tumor nuclei: tissue 144 mm(2) tissue (4 x 6 mm x 6 mm areas)

-Minimum amount of tumor area: 36 mm(2) tissue (1 x 6 mm x 6 mm area)

-These amounts are cumulative over up to 10 unstained slides and must have adequate percent tumor nuclei.

-Tissue fixation: formalin-fixed paraffin-embedded (FFPE), non-decalcified

 

Submit only 1 of the following specimens:

 

Specimen Type: Tissue block

Collection Instructions: Submit a formalin-fixed non-decalcified, paraffin-embedded tissue block.

 

Specimen Type: Tissue slide

Slides: 1 Stained and 10 unstained

Collection Instructions: Submit 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.


Specimen Type

Varies

Specimen Minimum Volume

5 unstained slides at 5-microns thickness

Specimen Stability Information

Specimen Type Temperature Time
Varies Ambient (preferred)
  Refrigerated 

Reject Due To

Specimens that have been decalcified (all methods)
Specimens that have not been formalin-fixed, paraffin-embedded
Extracted nucleic acid (DNA/RNA)
Reject

Reference Values

An interpretive report will be provided.

Day(s) Performed

Varies

Report Available

7 to 10 days

Specimen Retention Time

FFPE tissue block: Unused portions of blocks will be returned. Unused slides are stored indefinitely and not returned; Digital images are obtained and stored for all slides used in testing.

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

81287

88381-Microdissection manual