What is an ambulatory treatment test and what should I expect?

Wanting to know what to expect before an ambulatory treatment or test for prostate cancer is a very common step in preparing. In general, "ambulatory" means outpatient care, so it is usually done without staying overnight in the hospital, but what happens, how long it takes, and how to prepare can vary. The care team can explain the exact steps, any instructions to follow beforehand, and what recovery looks like, and writing questions down before the appointment can help. Members of this community who have had a similar experience are welcome to share what they learned to help others in the group.