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Prior Authorization Required*
*If prior authorization is not submitted, test may be delayed.
Test Overview
Test Methodology

The coding exons and flanking splice sites of the SLC9A6 gene are amplified using specific primers, and bidirectionally sequenced using a fluorescent method.

Test Usage

Analysis for the presence of SLC9A6 (OMIM:300231) mutations in patients with a phenotype consistent with X-Linked Mental Retardation, Christianson Type (OMIM:300243), which may have phenotypic similarities to Angelman Syndrome.

Reference Range *

Interpretive report provided.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Limitations

This assay will not detect large deletions in the SLC9A6 gene or intronic mutations outside the region sequenced in the SLC9A6 gene.

Test Details
Days Set Up
Monday - Friday
Analytic Time

21 - 28 days

Soft Order Code
MiChart Code
SLC9A6 Gene Sequencing, MMGL
  • Christianson Syndrome
  • Sodium/Hydrogen Exchanger 6 (NHE6)
  • SLC9A6S
  • SLC9A6 Gene Sequencing
  • SLC9A6SS
  • SLC9A6 Gene Seq Shadow
  • X-Linked Mental Retardation, Christianson Type (MRXSCH)
  • Autism / Intellectual Disability
MMGL Molecular Genetics
Specimen Requirements
Collection Instructions

Collect specimen in a lavender top tube. Send intact specimen within 24 hours if stored at room temperature or within 5 days if stored refrigerated. Include the patient's family history, pedigree, and ethnicity on the test requisition. Obtaining informed consent from the patient prior to genetic testing is strongly recommended. If desired, a UMHS Request and Consent for Genetic Testing form can be obtained from the MMGL Molecular Genetics Laboratory by contacting the MLabs Client Services Center at 800-862-7284 or online at

Normal Volume
5 - 10 mL EDTA whole blood
Minimum Volume
2 mL EDTA whole blood
Additional Information

By ordering this test the clinician acknowledges that informed consent has been obtained from the patient as required by applicable state or federal laws and the ordering clinician has authorization from the patient permitting MLabs to report the test results to the ordering clinician. Test includes medical geneticist interpretation of results billed as a separate additional charge. This test is not available without interpretation.

CPT Code
Fee Code
Pro Fee CPT