My daughter was diagnosed with ie (left ventrical flow) and had surgery to remove vegitation. all bloods were neg. why?

See below: The blood culture together with a vegetation on the cardiac leaves are a gold standard for a diagnosis of endocarditis, but it might be false-negative. There are currently more sensitive blood tests exist for a bacterial infection, like pcr, but they are very expensive send out tests and not all heath insurance companies are covering them.

Talk to MD: Some growths in the heart can be non-infectious, such as a myxoma. Talk to your surgeon and get a full description and explanation.