My dad had prostate cancer a few years ago, which was treated successfully with radiation. He now gets his PSA score twice a year -- once with his annual physic

My dad had prostate cancer a few years ago, which was treated successfully with radiation. He now gets his PSA score twice a year -- once with his annual physical, and 6 months later with his cancer doc. I wonder whether the biosensor could be something patients like him could have at home. (Also, now I'm imagining Apple telling customers they can urinate on the next generation of the watch.)