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Genetic Labs

Houston, Texas

Genetic Laboratory
Baylor Genetics Laboratories
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Medical Genetics Test Details

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Additional Affected Sibling for Trio
Test Information: Indications for Testing

The Additional Affected Sibling for Trio (Sibling Trio) test is to be ordered by a physician and must be accompanied with a consent form and detailed clinical information. The Sibling Trio should be ordered along with, or after a completed Trio (#1600) for the same biological family. The sibling is expected to be symptomatic but may not have the exact same symptoms as the proband. In general, the test is used when a patient's medical history and physical exam findings strongly suggest that there is an underlying genetic etiology. In some cases, the patient may have had an extensive evaluation consisting of multiple genetic tests, without identifying an etiology. If a complete Trio is not able to be sent along with or before the Sibling Trio, a physician may opt to order the proband only whole exome sequencing test (#1500) in an effort to expedite a possible diagnosis. See (Frequently Asked Questions (FAQ)) for additional details.

- Patient with undiagnosed genetic syndrome

Note: A complete Trio for the same biological family is required to interpret Sibling Trio results. See below for requisition, sample requirements, and further details.
Test Details
Test Code: 1602
Special Notes: The Additional Affected Sibling for Trio (Sibling Trio) test is a highly complex test that is newly developed for the identification of changes in a patient's DNA that are causative or related to their medical concerns. In contrast to current sequencing tests that analyze one gene or small groups of related genes at a time, the Sibling Trio test will analyze the exons or coding regions of thousands of genes simultaneously using next-generation sequencing techniques.

The principle of the test is to sequence nucleotide by nucleotide, the human exome of an individual to a depth of coverage necessary to build a consensus sequence with high accuracy. This consensus sequence is then compared to standards and references and the proband and parental WES data and the result is interpreted by board-certified laboratory directors and clinicians. By sequencing the exome of a patient, his or her sibling, and his or her parents and then comparing it to normal reference sequence, variations in an individual's DNA sequence can be identified and related back to the individual's medical concerns in an effort to discover the cause of the medical disorder.

For more information on specific coverage, click here: Whole Exome Sequencing Version 3 Coverage Search Tool
Technical Information
Methodology: Exome Capture and Next Generation Sequencing
Sample & Shipping Information
Test Requisition: Additional Affected Sibling for Trio
Specimen Type: Blood
Requirements: Draw blood in an EDTA (purple-top) tube(s) for the patient and both parents. Send at least 5cc (children) or 10cc (adults).
Shipping Conditions: Ship at room temperature in an insulated container by overnight courier. Do not heat or freeze. Sample must arrive within 72 hrs.

Specimen Type: Cultured Skin Fibroblast
Requirements: Send 2 T25 flasks at 80-100% confluence.
Shipping Conditions: Ship at room temperature in an insulated container by overnight courier. Do not heat or freeze.

Specimen Type: Purified DNA
Requirements: Send at least 20ug of purified DNA (minimal concentration of 50ng/uL; A260/A280 of ~1.7) for the patient and both parents.
Shipping Conditions: Ship at room temperature in an insulated container by overnight courier. Do not heat or freeze.

Turn Around Time: 8 weeks
Billing Information
List Price: *For Insurance or Institutional Prices, please call.
CPT Codes: 81415x1


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