In addition to a semi-annual PSA test (the last three scored 1.2, 0.9, 1.2) I also have a 3T mp-MRI done annually in June as part of the protocol for my AS program. For the fourth year in a row, the results were negative, and a follow-up MRI/TRUS targeted biopsy will not be done.
No matter how successful the previous tests have been, each additional test leads to test anxiety. The last PSA test I took in March, 2015 (score 1.2) followed a PSA test I took 10 days before which scored 1.670. This was processed by a different lab than the one that processed most of my previous exams. I immediately requested another test using my customary lab, which resulted in a score more in line with the scores of the previous 3 years.