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MLH1 Promoter Methylation

MLH1 PCR
Example Reports
Detected
Not Detected

Ordering Recommendation

Recommended test to distinguish between Lynch syndrome and sporadic noncolorectal tumors with loss of MLH1.

New York DOH Approval Status

This test is New York state approved.

Specimen Required

Patient Preparation
Collect

Tumor tissue.

Specimen Preparation

Tumor Tissue: Formalin fix (10 percent neutral buffered formalin) and paraffin embed tissue. Protect from excessive heat. Transport tissue block or 5 unstained 5-micron slides. Transport block and/or slide(s) in a tissue transport kit (ARUP Supply #47808) available online through eSupply using ARUP Connect or contact ARUP Client Services at 800-522-2787.

Storage/Transport Temperature

Room temperature. Also Acceptable: Refrigerated. Ship in cooled container during summer months.

Unacceptable Conditions

Specimens fixed in any fixative other than 10 percent neutral buffered formalin.
Less than 25 percent tumor.
Decalcified specimens.

Remarks

Include surgical pathology report.
If multiple specimens (blocks or slides) are sent to ARUP, they must be accompanied by one of the following: an order comment indicating that the ARUP pathologist should choose the specimen most appropriate for testing (e.g., "Choose best block"), or individual orders for each sample submitted. A Pathologist Block Selection Fee (ARUP test code 3002076) will be added to orders that utilize the first option. If multiple specimens are sent to ARUP without a request for pathologist block/slide selection or individual orders, they will be held until clarification is provided.

Stability

Ambient: Indefinitely; Refrigerated: Indefinitely; Frozen: Unacceptable

Methodology

Real-Time Polymerase Chain Reaction/Fluorescence Resonance Energy Transfer (FRET)

Performed

Varies

Reported

7-12 days

Reference Interval

Interpretive Data

Refer to report.

Compliance Category

Laboratory Developed Test (LDT)

Note

Hotline History

View Hotline History

 

Hotline History

Date of Change
Test Name Change
Methodology
Performance/Reported Schedule
Specimen Requirements
Reference Interval
Interpretive Data
Note
CPT Code
Component Change
Other Interface Change
New Test
Inactive
08/21/2023
X
X
X
02/21/2023
X
11/14/2022
X
N/A

CPT Codes

81288

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Components

Component Test Code* Component Chart Name LOINC
0051749 MLH1 Promoter Methylation 58416-9
2002148 Block ID 57723-9
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.

Aliases

  • HNPCC screening
  • Lynch syndrome screening
MLH1 Promoter Methylation