Hello, this is Kitt.
The two most common tests to confirm this diagnosis are blood tests and echocardiogram. Blood tests or cultures are used to detect the presence of bacteria, identify the bacteria and determine which antibiotics they are sensitive to. People with mitral valve prolapse are more prone to endocarditis.
This is a very condensed explanation. I see Tammy posted a web site for you that looks very good. Any further questions, please just post away.