Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Holes in the Heart ?
    ### Response:
    Doctors usually diagnose holes in the heart based on a physical exam and the results from tests and procedures. The exam findings for an atrial septal defect (ASD) often aren't obvious. Thus, the diagnosis sometimes isn't made until later in childhood or even in adulthood.
    