Please help really worried? they want to test for endocarditis.

Endocarditis ,IE: Ie is a rare infection inchildren without underlying heart disease. It is usually caused by bacteria and can be serious, however your doctor may want to look r/o ie because of fever or infection form an unknown source. It consist of blood tests and an echocardiogram usually. Most of the time these test are negative. If positive, it is very important not to delay treatment.