Maybe you didn't know that there would be an overnight study visit, and maybe any one of these details is enough for you to decide that you don't want to join after all. You can thank the study staff for their time and efforts, but at the same time politely decline to sign the consent form and leave the research center. There will be no hard feelings. In general, there is no cost to volunteers or their insurance agencies for any research related costs. Often insurance agencies are billed for procedures that would be done regardless of participation in the research study.
Some studies offer to pay the volunteer for their participation.
This is usually a modest amount meant to cover travel and parking expenses and any inconvenience the study might cause you. For example, studies that require overnight visits to the research center offer a more generous remuneration than other studies. All rights reserved.