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Pendred Syndrome/DFNB4 Nonsyndromic Hearing Loss (SLC26A4)




  • DFNB4 Nonsyndromic Hearing Loss and Deafness
  • Pendred Syndrome

Clinical Utility

  • Confirmation of a clinical diagnosis
  • Differential diagnosis from other types of hearing loss
  • Carrier testing in siblings or other relatives

Lab Method

  • Capillary Sequencing
  • Deletion/Duplication Analysis

Test Code


CPT Codes*


ABN Required


Turnaround Time**

4 weeks

Preferred Specimen

2-5 mL Blood - Lavender Top Tube

Alternative Specimen

Buccal Swabs

*The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

**Reporting times are typical and begin once the sample(s) are received at the GeneDx laboratory, but could be extended in situations outside GeneDx’s reasonable control.