Ntpobnp blood test

[Jalola]

Hi all. I had a bone marrow transplant 2 years ago. It put stress on my heart. Last week i had a echocardiogram which has come back good!!! Though my bnp level is 600... i am 38. So too high. My consultant is not worried though. Does this sound right?? Does a high bnp always mean heart failure?

Back 2 years ago my result said 33381 !!! It cant have been that high ever... surely?

Any ideas? Thankyou