WHO > Health topics > Clinical trials

Clinical trials

For the purposes of registration, a clinical trial is any research study that prospectively assigns human participants or groups of humans to one or more health-related interventions to evaluate the effects on health outcomes.

Interventions include but are not restricted to drugs, cells and other biological products, surgical procedures, radiological procedures, devices, behavioural treatments, process-of-care changes, preventive care, etc.

RELATED SITES

- International Clinical Trials Registry Platform (ICTRP)
- Research Policy and Cooperation

PUBLICATIONS

- Publications: clinical trials

RELATED LINKS

- Frequently asked questions: International Clinical Trials Registry Platform