The medical establishment now counsels against routine testing for PSA levels. If the test stays high what are you going to do, biopsy? The evidence says you are more likely to have serious complications from the biopsy and possible treatments than from the prostate itself. This one is tough to call but you should educate yourself as much as possible before proceeding so you know what you really want. Don't just rely on the opinion of your GP, they are all over the place on this and there is no telling whether your doctor has anything better to say than another. Better to decide for yourself.