The ISRCTN is a simple numeric system for the unique identification of randomised controlled trials worldwide. The ISRCTN Register also accepts registration of other forms of studies designed to assess the efficacy of health-care interventions.


The ISRCTN Register is owned by ISRCTN - a not-for-profit organisation. The scheme is administered on behalf of ISRCTN by Current Controlled Trials Ltd.

ISRCTN works with partners to improve the information publicly available about clinical trials.