"One of the takeaways from my experience was the importance of establishing a baseline PSA," said Rhodes. "A single score on a PSA test doesn't tell you anything. The goal is to identify the rate of change, not the absolute number. Plenty of people who get screened at age 50 have a PSA rate of 2. It's a normal or low score for a man of 48 unless you have a well-established baseline that tells you differently."