Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Coats disease ?
    ### Response:
    Is genetic testing available for Coats disease? Genetic testing is not available for most cases of Coats disease. Eighty to 90% of affected people have no evidence of a genetic predisposition to the condition and no affected family members. Rarely, Coats disease can be inherited as a feature of several different genetic syndromes.
    