Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Mitochondrial encephalomyopathy lactic acidosis and stroke-like episodes ?
    ### Response:
    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.
    