How many people do clinics screen per study?
The amount of people a clinic screens for a study will depend on several factors. For the most part, clinics will screen on a 4 to 1 ratio. That means for every position they need to fill, including backups, they will screen 4 people. So basically 1 in 4 people who screen will qualify for the study. Not only that, a small percentage of the people scheduled to screen cancel or don’t show up. Another small percentage will be disqualified for not meeting study requirements. There will be certain studies that have tougher or unusual requirements which require screening more people as few people qualify after screening.
