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Test ID LQTSG Long QT Syndrome Gene Panel, Varies

Ordering Guidance

This test is intended for genetic screening for and diagnosis of long QT syndrome.


For Brugada syndrome genetic testing, order SCN5A / Brugada Syndrome Multi-Gene Panel, Blood.


For comprehensive inherited cardiac arrhythmia genetic testing, order CARGG / Comprehensive Arrhythmia Gene Panel, Varies.


Customization of this panel and single gene analysis for any gene present on this panel are available. For more information see CGPH / Custom Gene Panel, Hereditary, Next-Generation Sequencing, Varies.


Targeted testing for familial variants (also called site-specific or known mutations testing) is available for the genes on this panel. See FMTT / Familial Mutation, Targeted Testing, Varies. To obtain more information about this testing option, call 800-533-1710.

Shipping Instructions

Specimen preferred to arrive within 96 hours of collection.

Necessary Information

Prior Authorization is available for this test. Submit the required form with the specimen.

Specimen Required

Patient Preparation: A previous bone marrow transplant from an allogenic donor will interfere with testing. Call 800-533-1710 for instructions for testing patients who have received a bone marrow transplant.


Specimen Type: Whole blood


Preferred: Lavender top (EDTA) or yellow top (ACD)

Acceptable: Any anticoagulant

Specimen Volume: 3 mL

Collection Instructions:

1. Invert several times to mix blood

2. Send whole blood specimen in original tube. Do not aliquot.

Specimen Stability Information: Ambient (preferred)/Refrigerated


. New York Clients-Informed consent is required. Document on the request form or electronic order that a copy is on file. The following documents are available:

-Informed Consent for Genetic Testing (T576)

-Informed Consent for Genetic Testing (Spanish) (T826)

2. Hereditary Cardiomyopathies and Arrhythmias Patient Information

3. Long QT Syndrome Gene Panel (LQTSG) Prior Authorization Ordering Instructions

4. If not ordering electronically, complete, print, and send a Cardiovascular Test Request Form (T724) with the specimen.

Useful For

Providing a genetic evaluation for patients with a personal or family history suggestive of long QT syndrome (LQTS)


Establishing a diagnosis of LQTS

Method Name

Sequence Capture and Targeted Next-Generation Sequencing followed by Polymerase Chain Reaction (PCR) and Sanger Sequencing.

Reporting Name

Long QT Syndrome Gene Panel

Specimen Type


Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Varies Varies

Reference Values

An interpretive report will be provided.

Day(s) Performed


Report Available

28 to 42 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test was developed, and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.

CPT Code Information


81406 x2



LOINC Code Information

Test ID Test Order Name Order LOINC Value
LQTSG Long QT Syndrome Gene Panel 55146-5


Result ID Test Result Name Result LOINC Value
617352 Test Description 62364-5
617353 Specimen 31208-2
617354 Source 31208-2
617355 Result Summary 50397-9
617356 Result 82939-0
617357 Interpretation 69047-9
617358 Additional Results In Process
617359 Resources 99622-3
617360 Additional Information 48767-8
617361 Method 85069-3
617362 Genes Analyzed 48018-6
617363 Disclaimer 62364-5
617364 Released By 18771-6

Prior Authorization

Insurance preauthorization is available for this testing; forms are available.


Patient financial assistance may be available to those who qualify. Patients who receive a bill from Mayo Clinic Laboratories will receive information on eligibility and how to apply.