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Diseases

Genetic and Rare Diseases Information Center (GARD)

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CADASIL


Other Names for this Disease

  • CASIL
  • Cerebral arteriopathy with subcortical infarcts and leukoencephalopathy
  • Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy
  • Dementia, hereditary multi-infarct type
  • Familial vascular leukoencephalopathy
See Disclaimer regarding information on this site. Some links on this page may take you to organizations outside of the National Institutes of Health.

Your Question

My doctor has ordered the MELAS test, but it is very expensive and the labs hardly take any insurance. Are there any other options?

Our Answer

We have identified the following information that we hope you find helpful. If you still have questions, please contact us.

What are the genetic testing options for mitochondrial encephalomyopathy lactic acidosis and stroke-like episodes (MELAS)?

Genetic testing for a particular condition is typically available from only a few clinical laboratories because these conditions are rare and the tests are ordered infrequently. It is not uncommon to send DNA samples to a laboratory in another state, or even to laboratories in Canada or Europe. Genetic tests are more complicated than standard blood tests and are usually much more expensive. Due to the high cost of these tests, insurance companies may or may not provide coverage. Doctors sometimes write a letter of medical necessity to the insurance company stating why a particular test is needed, which sometimes pursuades the insurance company to cover the test. These letters state the medical benefits that a person would receive from a test, and how the test would alter a person's medical care.

GeneTests lists the names of laboratories that perform genetic testing. This resource lists the contact information for the clinical laboratories conducting genetic testing for MELAS. Another option is to participate in a research study that is performing genetic testing. While the cost of testing is often covered by the research funding, the tests may be more experimental and less accurate. In addition, results may not be reported to participants, or it may take a much longer time to receive any results. To access the contact information for the research laboratory performing genetic testing for mitochondrial disorders (including MELAS), click here

Please note:  Most of the laboratories listed through GeneTests do not accept direct contact from patients and their families; therefore, if you are interested in learning more, you will need to work with a health care provider or a genetics professional.

Last updated: 12/22/2009
Other Names for this Disease
  • CASIL
  • Cerebral arteriopathy with subcortical infarcts and leukoencephalopathy
  • Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy
  • Dementia, hereditary multi-infarct type
  • Familial vascular leukoencephalopathy
See Disclaimer regarding information on this site. Some links on this page may take you to organizations outside of the National Institutes of Health.