Discover what clinical trials really involve before you volunteer.
Clinical Trial Questions Center is a free question-and-answer resource covering study participation, research procedures, consent documents, and the everyday terms you will see when you explore a trial.
Explore the types of studies
Start with the basics of each research category so listings and conversations make more sense.
- 01
General Clinical Trials
Structured research studies that follow a protocol to answer defined questions. They range from short single-visit studies to long-term programs.
- 02
Observational Studies
Researchers watch and record what happens over time without assigning a specific approach. Volunteers often complete surveys or periodic check-ins.
- 03
Interventional Studies
Volunteers are assigned to a specific approach so researchers can compare results. Assignment is described in the protocol and consent document.
- 04
Health Research
Studies that explore how the body works, how conditions develop, or how care can be improved. Some focus on healthy volunteers.
- 05
Behavioral Research
Studies that look at habits, sleep, learning, stress, or daily routines. Many involve questionnaires, journals, or short sessions.
Questions people ask most
Short, plain-language answers to the questions that come up before, during, and after a study.
Search all questions- What is a clinical trial?
- A clinical trial is a research study that follows a written plan, called a protocol, to answer specific questions about health, behavior, or care. Volunteers take part so researchers can learn something that cannot be learned any other way.
- Who runs clinical trials?
- Trials are run by research teams at universities, hospitals, independent research sites, and other organizations. Each team follows its own protocol and is reviewed by an ethics committee.
- Are all clinical trials testing something new?
- No. Some studies only observe people over time, some compare approaches that already exist, and some look at habits, sleep, diet, or daily routines.
- Do I have to be sick to join a study?
- Not always. Many studies look for healthy volunteers, while others look for people with a specific experience. Each study sets its own criteria.
What you can use here
- Searchable FAQ library
- Question submission form
- Beginner research guide
- Educational answers database
- Clinical terminology resources
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If you choose to, you can join the Clinical Trial Questions and Answers SMS Program featuring educational answers, FAQ announcements, and general research information. It is entirely optional, and every page on this site stays open to you either way.
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From the Learning Center
A beginner's guide to reading a study listing
Learn how to scan a listing for purpose, time commitment, location, and contact details.
Questions to bring to your first conversation
A practical checklist you can print or save before talking with a study team.
Understanding the consent document
What each section of a consent document usually covers and how to ask about it.
How we handle your choices
- SMS participation is always optional.
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- Mobile opt-in information is never transferred for third-party marketing or lead generation.
- Clinical Trial Questions Center is not a research organization or healthcare provider.
- Submitting a question never creates enrollment, eligibility, or a referral to any study.
Clinical Trial Questions Center is an independent educational resource. It is not a research organization, trial sponsor, or healthcare provider, and it does not conduct research, enroll participants, determine eligibility, or provide health advice.