I took my 3 year old cat Lily to the vet today for a yearly checkup/shots and was told that she had a heart murmur and that I was being referred to a cardiologist. The cardiology specialist just called and quoted the tests at $600-$900. Lily is an extremely healthy cat who has never had any other issues besides a URI as a kitten. I'm reading online that the heart murmur could have simply been her being stressed at her appointment. Is it worth it to go through with these tests at the risk that it could be something more serious?