ATTENTION: Cytogenetic testing for all sample types and infectious study add-on testing for prenatal specimens are being retired. Samples must be received no later than Friday, March 31, 2023. View list of retired tests and FAQs here.

Targeted Mosaic Variant Testing


  • Carrier/Variant-Specific Testing
  • Carrier/Variant-Specific Testing - Nuclear Variants

Clinical Utility

  • Testing parent(s) to clarify future reproductive risks when a variant was identified in a child
  • Testing a parent who is suspected to be mosaic due to a mild clinical presentation or the presence of only certain tissue-specific features of the disorder
  • Testing additional tissue samples to evaluate for the possibility of tissue-specific mosaicism in a proband
  • CLIA confirmation of suspected mosaic findings identified by a research study

Lab Method

  • Next-Gen Sequencing

Important Information

Insurance billing not accepted

Test Code


CPT Codes*


ABN Required


Turnaround Time**

3 weeks

Preferred Specimen

For Specimen Options, Please call 1-888-729-1206 (301-519-2100)

Alternative Specimen

For Specimen Options, Please call 1-888-729-1206 (301-519-2100)

*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.