You will be presented with information about the study. This is called the informed consent process. Members of the study team, including the researchers, will discuss this information with you. They will usually ask you questions to make sure that you understand the information.
Once you understand the information and decide to participate, you will be asked to sign the consent form. You might also be asked to sign other documents, such as a form giving permission to use your medical records.
After you sign the informed consent, the researchers may need to ask some basic questions or perform procedures to make sure you qualify to participate. If you participate in medical research, this may include a physical examination, blood tests or other procedures. This part of the research is called "screening".
Even if you give informed consent, you are not guaranteed a place in the research. In some cases, researchers can accept anyone who volunteers. In other cases, researchers can accept only a certain number of people or only people who fit exactly what they are looking for.
If you do not qualify, it does not mean something is wrong with you. It just means that the study was not for you. There might be other studies that you qualify for.
If you qualify for a study, you will go through the exact steps of the approved research plan. What you undergo during the research should be exactly what is described in the consent form.
What will happen (and for how long) depends on the goals of the research. Sometimes researchers will be able to work around your schedule. In other studies, visits might have to happen at very specific times. All of this should be explained to you during the informed consent process.