Active surveillance is a way to treat low-risk prostate cancer that doesn't pose an immediate risk to your well-being. If you choose active surveillance, your cancer will be closely monitored for any changes that would warrant more active treatment. You'll have regular checkups, prostate biopsies, and blood tests to measure prostate-specific antigen (PSA) levels. Over the years, active surveillance has emerged from a research concept to the preferred standard of care for most low-risk prostate cancer.