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.
Secondary ID
621858Useful For
Prognostication of newly diagnosed patients with glioblastoma
Identification of newly diagnosed glioblastoma patients that may derive benefit from alkylating chemotherapy (ie, temozolomide)
Therapy selection for newly diagnosed glioblastoma in older patients (>60-65 years)
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)
Specimen Type
VariesSpecimen 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.
Interpretation
The interpretation of molecular biomarker analysis includes an overview of the results and the associated diagnostic, prognostic, and therapeutic implications.
Method Description
Droplet digital polymerase chain reaction using a TaqMan assay is performed on bisulfite converted DNA to evaluate for the presence of increased levels of methylation involving CpG sites 75-80 and 84-87 within the promoter region of the MGMT gene.(Unpublished Mayo method)
Day(s) Performed
Varies
Report Available
7 to 10 daysSpecimen 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

CPT Code Information
81287
88381-Microdissection manual
LOINC Code Information
Test ID | Test Order Name | Order LOINC Value |
---|---|---|
MGMTD | MGMT Promoter Methylation Analysis | 60252-4 |
Result ID | Test Result Name | Result LOINC Value |
---|---|---|
621859 | Result Summary | 50397-9 |
621860 | Result | 60252-4 |
621861 | Interpretation | 69047-9 |
621862 | Additional Information | 48767-8 |
621863 | Specimen | 31208-2 |
621864 | Source | 31208-2 |
621865 | Tissue ID | 80398-1 |
621866 | Method | 85069-3 |
621867 | Disclaimer | 62364-5 |
621868 | Released by | 18771-6 |