Keep in mind that it is not the absolute PSA number that is important--it is the trend of increase in the PSA over time that indicates when further investigation is warranted. My husband had a low PSA when he was first diagnosed in 2005. He had no symptoms, but his internist did a digital rectal exam as part of an annual physical and sent him to a urologist based on feeling something in the prostate that was not normal. The urologist did a biopsy, which revealed pretty aggressive cancer in both sides of the prostate. My husband was only 58 when diagnosed, so he chose brachytherapy and external beam radiation and not surgery. He was in remission for 6 years before his first recurrence, which led to spots on his spine and his cancer being labelled Stage 4 in 2011. He has had another recurrence and various treatments along the way, and is currently getting Pluvicto treatments. His PSA has never been above single digits all these years--it was the rate of doubling that led to the detection of recurrences.