| Interpretive Data: |
Background Information for Hearing Loss, Nonsyndromic, Connexin 30 (GJB6) 2 Deletions:
Characteristics: Moderate to profound nonsyndromic hearing loss (NSHL).
Incidence: Approximately 1 in 30 individuals with NSHL has a GJB6 deletion; 1 in 100,000 in the general population.
Inheritance: Autosomal recessive. Compound heterozygotes for GJB2 and GJB6 mutations are affected. Twenty percent of GJB2 heterozygotes with NSHL have a GJB6 deletion; homozygosity for GJB6 deletions is rare.
Cause: GJB6 gene mutations.
Mutations Tested: 309kb del(GJB6-D13S1830), previously reported as 342kb, and 232kb del(GJB6-D13S1854).
Clinical Sensitivity: Dependent on ethnicity.
Clinical Specificity: 99 percent.
Methodology: Multiplex PCR using deletion-specific primers, followed by capillary gel electrophoresis.
Analytical Sensitivity and Specificity: Greater than 99 percent.
Limitations: GJB6 mutations other than the two targeted will not be identified. The etiology of hearing loss due to other genetic or environmental causes will not be determined. Rare diagnostic errors can occur due to primer site mutations.
Counseling and informed consent are recommended for genetic testing. Consent forms are available online at www.aruplab.com.
Refer to Statement C under Testing Information at http://www.aruplab.com.
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| CPT Code(s): |
83891 Isolation; 83900 Multiplex amplification; 83901 Additional amplification; 83909 Capillary electrophoresis; 83912 Interpretation and report. Additional CPT code modifiers may be required for procedures preformed to test for oncologic or inherited disorders.
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Cross References: |
GJB6 (Hearing Loss, Nonsyndromic, Connexin 30 (GJB6) 2 Deletions)
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