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ISRCTN registry

ISRCTN is a clinical trial registry recognized by the WHO and ICMJE that accepts planned, ongoing or completed studies of any design. ISRCTN is committed to supporting research transparency. The first ISRCTN numbers were issued in 2000, so we celebrated 20 years of ISRCTN in 2020.

Why register with us?

  • Our expert editors work with investigators to ensure that study records are clear and complete before publication
  • We send prompts to update records at key milestones
  • ISRCTN records include basic results summaries, protocols, published results links and data-sharing plans
  • ISRCTN records encourage public involvement by including plain English summaries and appear on the WHO ICTRP and Be Part of Research portals
Register your study today

New instruction videos now on YouTube

Watch our new videos on YouTube showing:New Content Item

The full playlist can be found here.

Our new world-first partnership with the Health Research Authority (HRA)

HRA squareSoon all CTIMPs (and later, all interventional studies) in the UK that receive a favourable research ethics committee (REC) opinion will be automatically submitted to ISRCTN using data from the HRA’s systems, meaning that trialists and sponsors will not have to apply for registration separately.

The partnership will create a simplified process for registration, take the burden away from research sponsors and researchers, and ensure that information about the trials is publicly available for the benefit of all.

The partnership is part of the HRA's Make it Public strategy and also supports the UK’s commitments to the G7 Therapeutics and Vaccines Clinical Trials Charter. Please see the HRA’s combined review guidance here and our statement here.

If you have any queries, please contact us at


20th Anniversary Quiz

How much do you know about the ISRCTN registry?

Clinical Trials Day 2020 Quiz: COVID-19

How much do you know about the clinical trials currently investigating COVID-19?

ISRCTN's response to COVID-19

ISRCTN has implemented several changes in order to support research transparency during the COVID-19 pandemic:

  • Standard search terms covid234to maximize discoverability
  • Guidance to facilitate same-day registration
  • Prompts to investigators to update records for studies paused due to COVID-19
  • Collaboration with UK organizations to enhance information consistency

Search for ‘COVID-19’ to see all the studies registered so far, and read our blogs: