The most deadly forms of enlarged prostate may need to be reclassified as their own disease, according to research coming out of Johns Hopkins.

The good news is that a simple blood test can differentiate between variants of the disease that can lead to kidney damage and those which will cause relatively little discomfort, said Robert Getzenberg, director of research of the James Buchanan Brady Urological Institute and professor of urology at the Johns Hopkins University School of Medicine.