If there are high levels of PSA, this means cancer might be the cause. Small amounts of PSA are considered normal. The problem with a PSA test is that sometimes it has a level in the middle. This may mean cancer, or it may not. If it is an early cancer tumor that can't be felt, then it is very important to find out before it gets any bigger, or spreads.
Doctors now can do a biopsy of the prostate gland.
A biopsy is when a doctor takes a small sample of cells from the area of concern. The word biopsy means to cut, or gather, a small sample. In the case of the prostate gland this is done with a biopsy needle. Your doctor uses an ultrasound device near your rectum, points it towards the prostate and looks for areas that appear harder than others. Then your doctor will take a biopsy needle and push it towards the prostate through the skin that is between the base of your penis and your rectum.