A clinical trial is a type of medical research study that tests an intervention to answer questions concerning the identification, treatment and management of illnesses and disease. An intervention may be a drug, device, procedure or a change in behavior (diet, nutrition or exercise). Clinical trials depend on human volunteers (participants) to answer these questions and improve health.
Clinical trials are carefully conducted and must follow a strict set of rules and regulations, called a protocol. The protocol is designed to protect the safety of the volunteer to the highest degree. Clinical trials must also be approved by an independent committee, called an Institutional Review Board, or IRB, that examines the risks and benefits of the study and determines if risks are reasonable.
Focus of Clinical Trials
There are different types of clinical trials; they do not always test medicines. Some look at the long-term effects of treatment or the impact of diet, nutrition and exercise on incidence of an illness or disease. Some need volunteers with specific illnesses and some need healthy volunteers. Some examine the effects of a new drug, vaccine or treatment and others examine large populations in natural settings.
Phases of Research
Clinical trials are conducted as part of one of four phases, and each phase has a specific goal.