Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Stargardt disease ?
    ### Response:
    Is genetic testing available for Stargardt disease? Yes. Genetic testing may help distinguish the type of Stargardt disease a person has, and provide information about the mode of inheritance and risks to other family members. The Genetic Testing Registry (GTR) provides information about the genetic tests available for Stargardt disease.
    