Hereditary Hemorrhagic Telangiectasia Sequencing
Label Mnemonic: HHTGENE
Epic Lab Code: LAB7339
Downtime Form: A-1a Miscellaneous Request
Commercial Mail-out Laboratory
5231 RCP
356-8593
Specimen(s):
Whole Blood
Collection Medium:
Lavender top tube 3 mL (EDTA)
Alternate Collection Media:
Pink top tube 6 mL (K2-EDTA) or Yellow top tube 8.5 mL (ACD solution A)
Minimum:
Preferred Minimum: 3.0 mL whole blood
Absolute Minimum: 1.0 mL whole blood
Turn Around Time:
28-35 days
Reference Range:
By report
Interpretive Data:
Background Information for Hereditary Hemorrhagic Telangiectasia (ACVRL1 and ENG) Sequencing Characteristics: Recurrent nosebleeds, telangiectases (mouth, face, hands, GI tract), arteriovenous malformations (lung, brain, liver, spine). Incidence: 1:5,000-10,000 Inheritance: Autosomal dominant Penetrance: Approaches 100 percent by age 40. Cause: Mutations in the endoglin (ENG), activin A receptor type II-like 1 (ACVRL1 or ALK1), SMAD4 or other unidentified gene(s). Clinical Sensitivity: Approximately 75 percent Methodology: Bidirectional sequencing of ENG and ACVRL1 coding regions and exon/intron boundaries. Analytic Sensitivity and Specificity: 99 percent
Comments:
This mailout test requires pathologist approval for orders during inpatient encounters. Mailouts staff will not process order without approval. The pathologist covering mailouts approval can be reached at pager #5379. If approval is given, the name of the pathologist can be selected in the drop-down menu to the right of the approval warning in Epic when ordering the test.

Please print, complete and submit the following forms to the lab, with the specimen and the A-1a Miscellaneous Request:

HHT Testing Consent Form (Full Gene)

   and the

Patient History for HHT from ARUP Laboratories.
Test Limitations:
Diagnostic errors can occur due to rare sequence variations. Regulatory region and intronic mutations, large deletions/duplications, and mutations in genes other than ENG and ACVRL1 will not be detected.
Methodology:
Polymerase Chain Reaction/Sequencing
CPT Code:
81406, 81479