@overage
Most R/Os will do a PSA before beginning your radiation treatments to get a base line.

Doing a PSA half way in through your radiation treatments is not something UFHPTI or Mayo Jacksonville does. Why? Because your prostate is getting bombarded by radiation and going through damage and irritation. A PSA would not be a gauge of how well radiation treatments success until months after treatments end to see of PSA is going down from the baseline taken before radiation.

This comes from my UHPTI R/O, Mayo R/O, and my Mayo PCP not a medical statement by me. But I had asked about PSA test prior to my radiation and was told the above.