Diagnostic and predictive testing for multiple endocrine neoplasia type 2.
- Patient Preparation
- Lavender (EDTA), pink (K2EDTA), or yellow (ACD Solution A or B).
- Specimen Preparation
- Transport 3 mL whole blood. (Min: 1 mL)
- Storage/Transport Temperature
- Unacceptable Conditions
- Ambient: 72 hours; Refrigerated: 1 week; Frozen: Unacceptable
Characteristics: Medullary carcinoma of the thyroid, pheochromocytoma, parathyroid adenoma/hyperplasia; dependent on specific MEN type 2 subtype.
Incidence: Approximately 1 in 30,000.
Inheritance: Autosomal dominant. 50 percent de novo mutations in MEN 2B.
Penetrance: Incomplete. Varies by subtype.
Cause: RET proto-oncogene mutations.
Clinical Sensitivity: 95 percent for MEN 2A, 88 percent for FMTC, and 98 percent for MEN 2B.
Methodology: Bidirectional sequencing of exons 5, 8, 10, 11, and 13-16.
Analytical Sensitivity and Specificity: Greater than 99 percent.
Limitations: Mutations in RET proto-oncogene introns, regulatory regions, or exons not targeted for sequencing will not be identified. Diagnostic errors can occur due to rare sequence variations.
|Component Test Code*||Component Chart Name||LOINC|
|0051391||MEN2 (RET) Sequencing||21733-1|
|2001364||MEN2 (RET) Sequencing, Specimen||31208-2|
- MEN2 sequencing
- MEN2:RET Gene Sequencing
- RET Proto-oncogene