Hereditary Hemorrhagic Telangiectasia (HHT), Proband

CPT Call client services.

Test Details


Analysis used for individuals affected clinically with HHT, usually the first person in the family to have genetic testing

Special Instructions

This test is performed at Impact Genetics, Bowmanville, Ontario, Canada. Please direct any questions regarding this test to Impact Genetics at 877-624-9769.

Test Includes

Genes tested: ENG (endoglin), HHT1; ACVRL1 (ALK1), HHT2; SMAD4 (MADH4)


This test was developed, and its performance characteristics determined, by LabCorp. It has not been cleared or approved by the US Food and Drug Administration (FDA).


Full gene sequencing and quantitative multiplex polymerase chain reaction (QM-PCR) to screen for copy number changes


Abdalla SA, Letarte M. Hereditary haemorrhagic telangiectasia: Current views on genetics and mechanisms of disease. J Med Genet. 2006 Feb; 43(2): 97-110. 15879500
Abdalla SA, Cymerman U, Rushlow D, et al. Novel mutations and polymorphisms in genes causing hereditary hemorrhagic telangiectasia. Hum Mutat. 2005 Mar; 25(3): 320-321. 15712271
Cohen JH, Faughnan ME, Letarte M, Vandezande K, Kennedy SJ, Krahn MD. Cost comparison of genetic and clinical screening in families with hereditary hemorrhagic telangiectasia. Am J Med Genet A. 2005 Aug 30; 137(2):153-160. 16059938
Gallione CJ, Richards JA, Letteboer TG, et al. SMAD4 mutations found in unselected HHT patients. J Med Genet. 2006 Oct; 43(10):793-797. 16613914
Prigoda NL, Savas S, Abdalla SA, et al. Hereditary haemorrhagic telangiectasia: Mutation detection, test sensitivity and novel mutations. J Med Genet. 2006 Sep; 43(9):722-728. 16690726

Specimen Requirements

Information on collection, storage, and volume


Whole blood or DNA


8.5 mL (adult); 5 mL (infant)

Minimum Volume

4 mL (adult); 2 mL (infant)


Yellow-top (ACD) tube or lavender-top (EDTA) tube

Storage Instructions

Room temperature. Stable at room temperature for seven days.


Whole blood samples must be received at Impact Genetics within five days of collection. Do not freeze.