Days Set Up
Monday - Friday
Analytic Time

28 days

MiChart Code
MLH1, MSH2, MSH6, PMS2 SEQ and Del/Dup
Soft Order Code

Test Updated:


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Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

Learn about how to properly label and where to ship specimens.

Order Kits and Supplies

MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

Visit our provider FAQ and learn about common questions to ordering tests.

Test Overview

Test Methodology

The entire coding sequences (exons plus 20 bp upstream and 20 bp downstream of each coding exon) of the targeted genes are captured, sequenced using NGS, and aligned to the human reference genome. A minimum NGS coverage of 20X for all coding exons is achieved. Copy Number variation is assessed by coverage depth within the targeted regions compared to a normalized set of controls. Copy number variants within the targeted regions that are of potential clinical significance will also be reported. In addition to NGS, Sanger sequencing is used to amplify and sequence MLH1 and MSH2 promoter regions and PMS2 to avoid known pseudogene regions. All reported variants of potential clinical significance will be confirmed by a different technology or platform.

Test Usage

Targeted NGS MLH1, MSH2, MSH6, and PMS2 sequencing and deletion/duplication analysis is used for the detection of germline pathogenic variants in patients at increased risk for hereditary colorectal cancer and cancers of the endometrium, stomach, ovary, small bowel, hepatobiliary tract, urinary tract, brain, and skin. Not all individuals with pathogenic MLH1, MSH2, MSH6, or PMS2 variants will have hereditary colorectal cancer. Patients with such pathogenic variants face an estimated 52-82% for colorectal cancer; 25-60% for endometrial cancer in women; 6-13% for gastric cancer; and 4-12% for ovarian cancer. Other types of cancers have also been reported in individuals with pathogenic MLH1, MSH2, MSH6, or PMS2 variants (

Reference Range

Interpretive report provided

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Offsite

Collect specimen in a lavender top tube. Send intact specimen within 24 hours if stored at room temperature or within 5 days if stored refrigerated. Include the patient's family history, pedigree, and ethnicity on the test requisition. Obtaining informed consent from the patient prior to genetic testing is strongly recommended. If desired, a UMHS Request and Consent for Genetic Testing form can be obtained from the MMGL Molecular Genetics Laboratory by contacting the MLabs Client Services Center at 800-862-7284 or online at….

Lavender Top Tube
Normal Volume
5 - 10 mL EDTA whole blood
Minimum Volume
5 mL EDTA whole blood

Billing Information

CPT Code
81292, 81294, 81295, 81297, 81298, 81300, 81317, 81319
Pro Fee Code

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.