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Rett Syndrome Sequence Analysis
Test Code15088
CPT Codes
81302<br />
Physician Attestation of Informed Consent
This germline genetic test requires physician attestation that patient consent has been received if ordering medical facility is located in AK, DE, FL, GA, IA, MA, MN, NV, NJ, NY, OR, SD or VT or test is performed in MA.
Includes
If amniotic fluid or chorionic villi sampling (CVS) is received, then an additional charge will be added for cell culture work (CPT code(s): 88235) if not already ordered
Preferred Specimen
5 mL whole blood collected in an EDTA (lavender-top) tube, ACD solution (yellow-top), EDTA (royal blue-top), sodium heparin (green-top), or sodium heparin (royal blue-top) tube
Minimum Volume
3 mL whole blood • 10 mL amniotic fluid • 10 mg chorionic villi • Cultured cells (75% confluent) in each of two sterile T-25 flasks
Other Acceptable Specimens
10 mL amniotic fluid collected in a sterile, plastic, leak-proof container • 10 mg chorionic villi collected in a sterile, leak-proof container • Cultured cells collected in each of two sterile T-25 flasks
Instructions
Do not hold specimen; forward to laboratory when specimen arrives. Contact performing laboratory for stability determination. For any other sample type call 866-GENE-INFO (1-866-436-3463).
Whole blood (preferred): Normal phlebotomy procedure. Specimen stability is crucial. Store and ship room temperature immediately. Do not freeze.
For fetal testing
1) Please call 1-866-GENE-INFO (1-866-436-3463) prior to submission
2) Documentation of parental carrier status must be provided
3) It is required that Maternal Cell Contamination Study, STR Analysis be ordered in conjunction with fetal testing. A separate tube of maternal blood (EDTA) is required for this test. Do not hold cells; forward to laboratory when cells arrive.
Amniotic fluid (acceptable): Normal collection procedure. Specimen stability is crucial. Store and ship at room temperature immediately. Do not refrigerate or freeze; forward to laboratory when sample arrives.
Amniocyte or Chorionic Villus (CVS) culture (acceptable): Two sterile T25 flasks, 75% confluent, filled with culture medium. Specimen stability is crucial. Store and ship at room temperature immediately. Do not refrigerate or freeze; forward to laboratory when cells arrive.
Dissected Chorionic Villus (CVS) biopsy (acceptable): 10-20 mg dissected chorionic villi collected in a sterile tube, filled with sterile culture medium. Specimen stability is crucial. Store and ship at room temperature immediately. Do not refrigerate or freeze; forward to laboratory when sample arrives.
Whole blood (preferred): Normal phlebotomy procedure. Specimen stability is crucial. Store and ship room temperature immediately. Do not freeze.
For fetal testing
1) Please call 1-866-GENE-INFO (1-866-436-3463) prior to submission
2) Documentation of parental carrier status must be provided
3) It is required that Maternal Cell Contamination Study, STR Analysis be ordered in conjunction with fetal testing. A separate tube of maternal blood (EDTA) is required for this test. Do not hold cells; forward to laboratory when cells arrive.
Amniotic fluid (acceptable): Normal collection procedure. Specimen stability is crucial. Store and ship at room temperature immediately. Do not refrigerate or freeze; forward to laboratory when sample arrives.
Amniocyte or Chorionic Villus (CVS) culture (acceptable): Two sterile T25 flasks, 75% confluent, filled with culture medium. Specimen stability is crucial. Store and ship at room temperature immediately. Do not refrigerate or freeze; forward to laboratory when cells arrive.
Dissected Chorionic Villus (CVS) biopsy (acceptable): 10-20 mg dissected chorionic villi collected in a sterile tube, filled with sterile culture medium. Specimen stability is crucial. Store and ship at room temperature immediately. Do not refrigerate or freeze; forward to laboratory when sample arrives.
Transport Temperature
Room temperature
Specimen Stability
Whole blood
Room temperature: 14 days
Refrigerated: 14 days
Frozen: Unacceptable
Fetal Specimen
Room temperature: 48 hours
Refrigerated: Unacceptable
Frozen: Unacceptable
Room temperature: 14 days
Refrigerated: 14 days
Frozen: Unacceptable
Fetal Specimen
Room temperature: 48 hours
Refrigerated: Unacceptable
Frozen: Unacceptable
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Do not reject. Forward to performing laboratory for evaluation of sample.
Methodology
Next Generation Sequencing
FDA Status
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.
Setup Schedule
Set up: Mon; Report available: 10-14 days
Limitations
The sequencing test can only detect mutations in about 80% of patients with classic Rett syndrome. Therefore, a negative test result does not rule out the clinical diagnosis of Rett syndrome.
Clinical Significance
Sequence analysis of the entire amino acid coding region (exons 1-4) and splice junction sites of the MECP2 gene will detect disease causing variants in approximately 80% Of individuals with classic Rett Syndrome. This test will establish a clinical diagnosis of Rett Syndrome in females. This test will also establish the etiology of severe neonatal encephalopathy in males.
