Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Parkinson's Disease ?
    ### Response:
    There are currently no blood or laboratory tests to diagnose sporadic Parkinson's disease. Diagnosis is based on a person's medical history and a neurological examination, but the disease can be difficult to diagnose accurately. Doctors may sometimes request brain scans or laboratory tests in order to rule out other diseases.
    