Long QT Syndrome (LQTS)

Long QT syndrome (LQTS) is a cardiac disorder due to abnormal ion channel function characterized by prolongation of the QT interval on ECG. 75% of cases of LQTS are due to known genetic causes. It is associated with increased risk for syncope (unexplained fainting), ventricular arrhythmia and sudden cardiac death in young adults with normal heart structure. Sudden death is the first and final symptom in 10-15% of individuals with this diagnosis. LQTS has an estimated prevalence greater than 1 in 3000 individuals, occurs in all ethnicities, and results in approximately 4000 deaths annually in the US. The diagnosis of LQTS is based on clinical history, ECG findings and family history. Typically, the disorder manifests in patients younger than 40 years of age, and sometimes as early as infancy. Patients often have a history of syncope or palpitations in the absence of any other causes, such as medications, structural heart abnormalities, myocardial ischemia, or electrolyte imbalances. The circumstances under which syncope occurs (with exercise, with auditory stimulation, at rest) may further suggest a particular subtype of LQTS. In some patients, syncope may be mistakenly diagnosed as seizures. LQTS may be present even in the absence of any clinical symptoms, and in some patients sudden cardiac death occurs without any preceding symptoms and without an identifiable cause at autopsy. Inherited LQTS may underlie up to 10-15% of sudden infant death syndrome (SIDS) cases.

Tests Available

Forms and Documents

Test Details

ABCC9, AKAP9, ANK2, CACNA1C, CACNA2D1, CACNB2, CALM1, CALM2, CALM3, CASQ2, CAV3, CTNNA3, DES, DSC2, DSG2, DSP, FLNC, GATA4, GATA5, GATA6, GJA5, GNB5, GPD1L, HCN4, JUP, KCNA5 , KCND3, KCNE1, KCNE1L, KCNE2, KCNE3, KCNH2(HERG), KCNJ2, KCNJ5, KCNJ8, KCNQ1, LDB3, LMNA, MYL4, NKX2-5, PKP2, PLN, PPA2, RANGRF, RYR2, SCN10A, SCN1B, SCN2B, SCN3B, SCN4B, SCN5A, SNTA1, TECRL, TGFB3, TMEM43, TRDN, TRPM4, TTN
  • Molecular confirmation of a clinical diagnosis in symptomatic individuals
  • Risk assessment of asymptomatic family members of a proband with arrhythmia
  • Differentiation of hereditary arrhythmia from acquired (non-genetic) arrhythmia
  • Recurrence risk calculation
  • Deletion/Duplication Analysis
  • Next-Gen Sequencing

Ordering

695
4 weeks
2-5 mL Blood - Lavender Top Tube
Oral Rinse (30-40 mL) | Buccal Swabs

Billing

81413x1, 81414x1
Yes
Yes
* For price inquiries please email zebras@genedx.com

Forms and Documents

Test Details

AKAP9, ANK2, CACNA1C, CALM1, CALM2, CALM3, CAV3, KCNE1, KCNE2, KCNH2(HERG), KCNJ2, KCNJ5, KCNQ1, SCN4B, SCN5A, SNTA1, TRDN
  • Confirmation of a clinical diagnosis in symptomatic patients
  • Risk assessment for asymptomatic family members of a proband with LQTS
  • Differentiation of hereditary LQTS from acquired (non-genetic) causes of LQTS.
  • Prenatal diagnosis in families with a known pathogenic variant
  • Deletion/Duplication Analysis
  • Next-Gen Sequencing

Ordering

727
4 weeks
2-5 mL Blood - Lavender Top Tube
Oral Rinse (30-40 mL) | Buccal Swabs

Billing

81403 x1, 81404x1, 81406x2, 81414x1
Yes
Yes
* For price inquiries please email zebras@genedx.com

Forms and Documents

Test Details

ABCC9, ACTC1, ACTN2, AKAP9, ALMS1, ALPK3, ANK2, ANKRD1, BAG3, BRAF, CACNA1C, CACNA2D1, CACNB2, CALM1, CALM2, CALM3, CASQ2, CAV3, CHRM2, CRYAB, CSRP3, CTNNA3, DES, DMD, DOLK, DSC2, DSG2, DSP, DTNA, EMD, EYA4, FHL1, FKRP, FKTN, FLNC, GAA, GATA4, GATA5, GATA6, GATAD1, GJA5, GLA, GNB5, GPD1L, HCN4, HFE, HRAS, ILK, JPH2, JUP, KCNA5 , KCND3, KCNE1, KCNE1L, KCNE2, KCNE3, KCNH2(HERG), KCNJ2, KCNJ5, KCNJ8, KCNQ1, KRAS, LAMA4, LAMP2, LDB3, LMNA, LRRC10, MAP2K1, MAP2K2, MIB1, MTND1, MTND5, MTND6, MTTD, MTTG, MTTH, MTTI, MTTK, MTTL1, MTTL2, MTTM, MTTQ, MTTS1, MTTS2, MURC, MYBPC3, MYH6, MYH7, MYL2, MYL3, MYL4, MYLK2, MYOZ2, MYPN, NEBL, NEXN, NKX2-5, NRAS, PDLIM3, PKP2, PLN, PPA2, PRDM16, PRKAG2, PTPN11, RAF1, RANGRF, RBM20, RIT1, RYR2, SCN10A, SCN1B, SCN2B, SCN3B, SCN4B, SCN5A, SGCD, SHOC2, SNTA1, SOS1, TAZ, TBX20, TCAP, TECRL, TGFB3, TMEM43, TMPO, TNNC1, TNNI3, TNNT2, TOR1AIP1, TPM1, TRDN, TRPM4, TTN, TTR, TXNRD2, VCL
  • Molecular confirmation of a clinical diagnosis in symptomatic patients
  • Risk assessment of asymptomatic family members of a proband with cardiomyopathy and/or arrhythmia
  • Differentiation of hereditary cardiomyopathy and/or arrhythmia from acquired (non-genetic) cardiomyopathy and/or arrhythmia
  • Recurrence risk calculation
  • Deletion/Duplication Analysis
  • Next-Gen Sequencing

Ordering

935
4 weeks
2-5 mL Blood - Lavender Top Tube
Oral Rinse (30-40 mL) | Buccal Swabs

Billing

81413x1, 81414x1
Yes
Yes
* For price inquiries please email zebras@genedx.com

Forms and Documents

Test Details

ANK2, CALM1, CALM2, CALM3, CASQ2, CAV3, KCNE1, KCNE2, KCNH2(HERG), KCNJ2, KCNQ1, PPA2, RYR2, SCN5A
  • Genetic diagnosis in sudden unexplained death
  • Recurrence risk information for family members
  • Deletion/Duplication Analysis
  • Next-Gen Sequencing

Ordering

J552
4 weeks
2-5 mL Blood - Lavender Top Tube
Oral Rinse (30-40 mL) | Buccal Swabs

Billing

81413x1, 81414x1
Yes
Yes
* For price inquiries please email zebras@genedx.com

Forms and Documents

CREATE A CUSTOM PANEL

Test Details

  • Molecular confirmation of a clinical diagnosis in symptomatic patients
  • Risk assessment of asymptomatic family members of a proband with cardiomyopathy and/or arrhythmia
  • Differentiation of hereditary cardiomyopathy and/or arrhythmia from acquired (non-genetic) cardiomyopathy and/or arrhythmia
  • Recurrence risk calculation

Customizable Cardiology Panel

  • Deletion/Duplication Analysis
  • Next-Gen Sequencing

Ordering

935C
4 weeks
2-5 mL Blood - Lavender Top Tube
Oral Rinse (30-40 mL) | Buccal Swabs

Billing

81413x1, 81414x1
No
Yes
* For price inquiries please email zebras@genedx.com

Forms and Documents

CREATE A CUSTOM PANEL

Test Details

  • Confirmation of clinical diagnosis in symptomatic patients
  • Genetic counseling and risk assessment of asymptomatic family members of a proband with a hereditary cardiovascular condition

Customizable Cardiology Panel

  • Next-Gen Sequencing
  • Deletion/Duplication Analysis

Ordering

J779
4 weeks
2-5 mL Blood - Lavender Top Tube
Oral Rinse (30-40 mL) | Buccal Swabs

Billing

Varies by gene
No
Yes
* For price inquiries please email zebras@genedx.com

Forms and Documents

CREATE A CUSTOM PANEL

Test Details

  • Molecular confirmation of a clinical diagnosis in symptomatic individuals
  • Risk assessment of asymptomatic family members of a proband with arrhythmia
  • Differentiation of hereditary arrhythmia from acquired (non-genetic) arrhythmia
  • Recurrence risk calculation

Customizable Cardiology Panel

  • Deletion/Duplication Analysis
  • Next-Gen Sequencing

Ordering

695C
4 weeks
2-5 mL Blood - Lavender Top Tube
Oral Rinse (30-40 mL) | Buccal Swabs

Billing

81413x1, 81414x1
No
Yes
* For price inquiries please email zebras@genedx.com

Forms and Documents

CREATE A CUSTOM PANEL

Test Details

  • Confirmation of a clinical diagnosis in symptomatic patients
  • Risk assessment for asymptomatic family members of a proband with LQTS
  • Differentiation of hereditary LQTS from acquired (non-genetic) causes of LQTS.
  • Prenatal diagnosis in families with a known pathogenic variant

Customizable Cardiology Panel

  • Deletion/Duplication Analysis
  • Next-Gen Sequencing

Ordering

727C
4 weeks
2-5 mL Blood - Lavender Top Tube
Oral Rinse (30-40 mL) | Buccal Swabs

Billing

81403x1, 81404x1, 81406x2, 81414x1
No
Yes
* For price inquiries please email zebras@genedx.com

Forms and Documents

CREATE A CUSTOM PANEL

Test Details

  • Genetic diagnosis in sudden unexplained death
  • Recurrence risk information for family members

Customizable Cardiology Panel

  • Deletion/Duplication Analysis
  • Next-Gen Sequencing

Ordering

J552C
4 weeks
2-5 mL Blood - Lavender Top Tube
Oral Rinse (30-40 mL) | Buccal Swabs

Billing

81413x1, 81414x1
No
Yes
* For price inquiries please email zebras@genedx.com

Forms and Documents

Test Details

AKAP9, ANK2, CALM1, CALM2, CALM3, CASQ2, CAV3, CTNNA3, DES, DSC2, DSG2, DSP, FLNC, GATA4, GATA5, GATA6, GJA5, GNB5, JUP, KCNA5 , KCNE1, KCNE1L(KCNE5), KCNE2, KCNJ2, KCNJ5, KCNQ1, LDB3, LMNA, MYL4, NKX2-5, PLN, PPA2, RANGRF, RYR2, SCN4B, SNTA1, TECRL, TGFB3, TMEM43, TRDN, TTN
  • Molecular confirmation of a clinical diagnosis in symptomatic individuals
  • Risk assessment of asymptomatic family members of a proband with arrhythmia
  • Differentiation of hereditary arrhythmia from acquired (non-genetic) arrhythmia
  • Recurrence risk calculation
  • Next-Gen Sequencing
  • ExonArray CGH

Ordering

481RE
4 weeks
2-5 mL Blood - Lavender Top Tube
Oral Rinse (30-40 mL) | Buccal Swabs

Billing

81406x2; 81408x1
Yes
Yes
* For price inquiries please email zebras@genedx.com

Forms and Documents

Test Details

ABCC9, AKAP9, CACNA1C, CACNA2D1, CACNB2, CAV3, CTNNA3, DES, DSC2, DSG2, DSP, FLNC, GATA4, GATA5, GATA6, GJA5, GNB5, GPD1L, HCN4, JUP, KCNA5 , KCND3, KCNE1, KCNE1L(KCNE5), KCNE2, KCNE3, KCNJ5, KCNJ8, KCNQ1, LDB3, LMNA, MYL4, NKX2-5, PKP2, PLN, PPA2, RANGRF, SCN10A, SCN1B, SCN2B, SCN3B, SCN4B, SCN5A, SNTA1, TGFB3, TMEM43, TRPM4, TTN
  • Molecular confirmation of a clinical diagnosis in symptomatic individuals
  • Risk assessment of asymptomatic family members of a proband with arrhythmia
  • Differentiation of hereditary arrhythmia from acquired (non-genetic) arrhythmia
  • Recurrence risk calculation
  • Next-Gen Sequencing
  • ExonArray CGH

Ordering

482RE
4 weeks
2-5 mL Blood - Lavender Top Tube
Oral Rinse (30-40 mL) | Buccal Swabs

Billing

81404x1; 81406x2; 81407x1
Yes
Yes
* For price inquiries please email zebras@genedx.com

Forms and Documents

Test Details

ABCC9, CACNA2D1, CACNB2, CASQ2, CTNNA3, DES, DSC2, DSG2, DSP, FLNC, GATA4, GATA5, GATA6, GJA5, GNB5, GPD1L, HCN4, JUP, KCNA5 , KCND3, KCNE1L(KCNE5), KCNE3, KCNJ8, LDB3, LMNA, MYL4, NKX2-5, PKP2, PLN, PPA2, RANGRF, RYR2, SCN10A, SCN1B, SCN2B, SCN3B, TECRL, TGFB3, TMEM43, TRPM4, TTN
  • Molecular confirmation of a clinical diagnosis in symptomatic individuals
  • Risk assessment of asymptomatic family members of a proband with arrhythmia
  • Differentiation of hereditary arrhythmia from acquired (non-genetic) arrhythmia
  • Recurrence risk calculation
  • Next-Gen Sequencing
  • ExonArray CGH

Ordering

727RE
4 weeks
2-5 mL Blood - Lavender Top Tube
Oral Rinse (30-40 mL) | Buccal Swabs

Billing

81404s1; 81406x2; 81408x1
Yes
Yes
* For price inquiries please email zebras@genedx.com

Forms and Documents

Test Details

ABCC9, AKAP9, CACNA1C, CACNA2D1, CACNB2, CTNNA3, DES, DSC2, DSG2, DSP, FLNC, GATA4, GATA5, GATA6, GJA5, GNB5, GPD1L, HCN4, JUP, KCNA5 , KCND3, KCNE1L(KCNE5), KCNE3, KCNJ5, KCNJ8, LDB3, LMNA, MYL4, NKX2-5, PKP2, PLN, RANGRF, SCN10A, SCN1B, SCN2B, SCN3B, SCN4B, SNTA1, TECRL, TGFB3, TMEM43, TRDN, TRPM4, TTN
  • Molecular confirmation of a clinical diagnosis in symptomatic individuals
  • Risk assessment of asymptomatic family members of a proband with arrhythmia
  • Differentiation of hereditary arrhythmia from acquired (non-genetic) arrhythmia
  • Recurrence risk calculation
  • Next-Gen Sequencing
  • ExonArray CGH

Ordering

J552RE
4 weeks
2-5 mL Blood - Lavender Top Tube
Oral Rinse (30-40 mL) | Buccal Swabs

Billing

81403x1; 81406x2
Yes
Yes
* For price inquiries please email zebras@genedx.com

Forms and Documents

Test Details

ABCC9, ACTC1, ACTN2, AKAP9, ALMS1, ALPK3, ANK2, ANKRD1, BAG3, BRAF, CACNA1C, CACNA2D1, CACNB2, CALM1, CALM2, CALM3, CASQ2, CAV3, CHRM2, CRYAB, CSRP3, DMD, DOLK, DTNA, EMD, EYA4, FHL1, FKRP, FKTN, GAA, GATA4, GATA5, GATA6, GATAD1, GJA5, GLA, GNB5, GPD1L, HCN4, HFE, HRAS, ILK, JPH2, KCNA5 , KCND3, KCNE1, KCNE1L(KCNE5), KCNE2, KCNE3, KCNJ2, KCNJ5, KCNJ8, KCNQ1, KRAS, LAMA4, LAMP2, LRRC10, MAP2K1, MAP2K2, MIB1, MTND1, MTND5, MTND6, MTTD, MTTG, MTTH, MTTI, MTTK, MTTL1, MTTL2, MTTM, MTTQ, MTTS1, MTTS2, MURC, MYBPC3, MYH6, MYH7, MYL2, MYL3, MYL4, MYLK2, MYOZ2, MYPN, NEBL, NEXN, NKX2-5, NRAS, PDLIM3, PPA2, PRDM16, PRKAG2, PTPN11, RAF1, RANGRF, RBM20, RIT1, SCN10A, SCN1B, SCN2B, SCN3B, SCN4B, SGCD, SHOC2, SNTA1, SOS1, TAZ, TBX20, TCAP, TECRL, TMPO, TNNC1, TNNI3, TNNT2, TOR1AIP1, TPM1, TRDN, TRPM4, TTR, TXNRD2, VCL
  • Molecular confirmation of a clinical diagnosis in symptomatic patients
  • Risk assessment of asymptomatic family members of a proband with cardiomyopathy and/or arrhythmia
  • Differentiation of hereditary cardiomyopathy and/or arrhythmia from acquired (non-genetic) cardiomyopathy and/or arrhythmia
  • Recurrence risk calculation
  • Next-Gen Sequencing
  • ExonArray CGH

Ordering

483RE
4 weeks
2-5 mL Blood - Lavender Top Tube
Oral Rinse (30-40 mL) | Buccal Swabs

Billing

81405x2; 81406x2; 81407x1
Yes
Yes
* For price inquiries please email zebras@genedx.com

Forms and Documents

Test Details

ANK2, CACNA1C, CACNA2D1, CACNB2, CALM1, CALM2, CALM3, CASQ2, GATA5, GATA6, GJA5, GNB5, GPD1L, KCNA5 , KCND3, KCNE1, KCNE1L(KCNE5), KCNE2, KCNE3, KCNJ2, KCNJ5, KCNJ8, KCNQ1, MYL4, PPA2, RANGRF, SCN10A, SCN1B, SCN2B, SCN3B, SCN4B, SNTA1, TECRL, TRDN, TRPM4
  • Molecular confirmation of a clinical diagnosis in symptomatic patients
  • Risk assessment of asymptomatic family members of a proband with cardiomyopathy and/or arrhythmia
  • Differentiation of hereditary cardiomyopathy and/or arrhythmia from acquired (non-genetic) cardiomyopathy and/or arrhythmia
  • Recurrence risk calculation
  • Next-Gen Sequencing
  • ExonArray CGH

Ordering

694RE
4 weeks
2-5 mL Blood - Lavender Top Tube
Oral Rinse (30-40 mL) | Buccal Swabs

Billing

81403x1; 81406x2
Yes
Yes
* For price inquiries please email zebras@genedx.com