Was the person a patient? If so, it can count as clinical experience although some people will differ in that opinion.
Were you in the initial steps of a research endeavor meant to generate new knowledge? Did you have any say in the design of the study, hypothesis development, selection of study instruments (surveys, screening tools, etc)? If so, it might be more "research" than clinical volunteering (there's just clinical employment and clinical volunteering, in terms of tags on AMCAS, right?)
You need more clinical volunteering. You might as well tag this as "clinical volunteering" and describe your role as collecting information from patients regarding their satisfaction with their care.
One last question? Are you face-to-face with the patients or are you communicating with them by phone or email after they leave the facility?