### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
I have a prostate biopsy scheduled next week, and Id like to be at least somewhat mentally prepared for the outcome.  I am reading the journals (I work at a university) to try to determine the likelihood I have prostate cancer based on my PSA results (7.75 ng/ml).  No male relative (father, grandfather, uncles) has had prostate cancer to my knowledge.  My history of PSA readings during 2010 was that I had 4 tests (Jan 2.5, June 2.3, Nov 16th 4.75, December 1st 2.5).  I am 48 years old, I weigh 145 lbs, Im 511.  In July 2010 I had a prostate ultrasound, which showed a darkened area, but the doppler test that was part of the exam did not show blood flow in that area.  I have not had any urinary symptoms. I have had some erectile dysfunction but I am otherwise healthy. I was constipated at the time of the PSA test. Unfortunately all the journal articles and risk calculators Ive found apply mostly to men 55 and over, so Im not sure whether the PSA results are worse because of my age or better.

### output:

Hi, dairy have gone through your question. I can understand your concern. PSA is the marker of prostate cancer.  PSA level more than 4 indicate suspicious for prostate cancer.  However, PSA level can increase in benign prostatic hyperplasia or prostatitis.  So definitive diagnosis depends on biopsy.  According to your PSA level there is chance of cancer, but it may not be there.  So don't worry much about that.  Just go for biopsy and take treatment accordingly. Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using Chat Doctor. Wish you a very good health.