Ordering Recommendation
Use to determine etiology of long QT syndrome (LQTS) in symptomatic individuals. Useful for presymptomatic testing in individuals with a family history of LQTS or sudden cardiac death.
Mnemonic
Methodology
Massively Parallel Sequencing / Exonic Oligonucleotide-based CGH Microarray
Performed
Varies
Reported
3-6 weeks
New York DOH Approval Status
Specimen Required
Lavender (EDTA) or Yellow (ACD Solution A or B).
Transport 3 mL whole blood. (Min: 1.5 mL)
Refrigerated.
Serum or plasma; grossly hemolyzed or frozen specimens
Ambient: 72 hours; Refrigerated: 1 week; Frozen: Unacceptable
Reference Interval
By report
Interpretive Data
Refer to report.
This test was developed and its performance characteristics determined by ARUP Laboratories. It has not been cleared or approved by the US Food and Drug Administration. This test was performed in a CLIA certified laboratory and is intended for clinical purposes.
Counseling and informed consent are recommended for genetic testing. Consent forms are available online.
Laboratory Developed Test (LDT)
Note
CACNA1C, CALM1**, CALM2**, CAV3, KCNE1, KCNE2, KCNH2, KCNJ2, KCNQ1, SCN5A
** - Deletion/duplication detection is not available for this gene.
Hotline History
Hotline History
CPT Codes
81228; 81403; 81404; 81406; 81407; 81414; 81479
Components
Component Test Code* | Component Chart Name | LOINC |
---|---|---|
3001604 | Long QT Interp | 41103-3 |
3001681 | Long QT Specimen | 31208-2 |
Aliases
- LQTS