Analytic Time

14 - 28 days

Soft Order Code

Test Updated:


Myotonic Dystrophy, Type 1

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All specimens should be accompanied by a requisition.

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Test Overview

Test Methodology

Polymerase Chain Reaction (PCR), Fragment Analysis and Southern Blot

Test Usage

Detects CTG repeat expansions in the muscle protein kinase (DMPK) gene.

Reference Range

5-37 CTG trinucleotide repeats

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

Specimen Requirements

Collection Offsite

Collect specimen in sufficient lavender top tubes. Send intact whole blood specimen at room temperature.

Lavender Top Tube
Normal Volume
8 mL EDTA whole blood (peds 2 mL whole blood)
Minimum Volume
6 mL EDTA whole blood (peds 1 mL whole blood)

Billing Information

CPT Code
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.