Last updated July 20, 2024

Clinical trial registration

Any research study (clinical trial) that prospectively assigns human participants or groups of humans to one or more health-related interventions to evaluate the effects on health outcomes must be registered. Authors have 6 months from the first patient enrollment to register the trial, but we recommends registration prior to enrollment according to the ICMJE guidelines on trial registration. This registration policy applies to prospective, randomized, controlled trials only. Authors must provide the registration identification number and the URL for the trial's registry.

Sample wording: This study is registered at [URL]. The registration identification number is [registration identification number]. 

Some registries are listed below:

Australian New Zealand Clinical Trials Registry

ClinicalTrials.gov

ISRCTN Register

UMIN Clinical Trials Registry

Nederlands Trial Register

Brazilian Clinical Trials Registry (ReBec)

Clinical Research Information Service (CRiS), Republic of Korea

Clinical Trials Registry - India (CTRI)

Cuban Public Registry of Clinical Trials (RPCEC)

EU Clinical Trials Register (EU-CTR)

German Clinical Trials Register (DRKS)

Iranian Registry of Clinical Trials (IRCT)

Japan Primary Registries Network (JPRN)

Pan African Clinical Trial Registry (PACTR)

Sri Lanka Clinical Trials Registry (SLCTR)

Please click on the links below to download the sample documents of clinical trial registration statement: