Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Gastroparesis ?
    ### Response:
    Gastroparesis is diagnosed through a physical exam, medical history, blood tests, tests to rule out blockage or structural problems in the GI tract, and gastric emptying tests. Tests may also identify a nutritional disorder or underlying disease. To rule out any blockage or other structural problems, the health care provider may perform one or more of the following tests:

    