There are many clinical research studies being conducted at UCSD that are seeking volunteers. All studies have guidelines for INCLUSION/EXCLUSION CRITERIA which must be followed. When a research study is designed, it is necessary to control all factors that might influence the results. Guidelines are established to determine who should and should not be included in the research study. These might include age, gender, weight, race, existing diseases, medications, allergies, just to list a few. If you volunteer to participate in a study and are not selected to be a full participant once you are screened, it is not uncommon. Please do not be discouraged. There are many studies looking at a large variety of wellness and disease issues, so if one isn’t a good match, there are others that might be. We encourage you to volunteer!