Why is clinical trial registration required and where is it typically done?

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Registration of clinical trials exists to promote openness and fairness in research. By making key details about a study publicly available before participants are enrolled, it creates a transparent record of what the trial intends to do, including its purpose, design, primary and secondary outcomes, eligibility criteria, and planned analyses. This upfront disclosure helps prevent selective reporting or changing outcomes after data are collected, which in turn reduces publication bias—the tendency for only favorable results to see the light of day.

Registries like ClinicalTrials.gov, the World Health Organization ICTRP, and national or regional registries provide a centralized, searchable place where researchers, clinicians, patients, and policymakers can find information about ongoing and completed trials. Registering before enrollment ensures the protocol is established in advance, which supports accountability and lets others track the study’s progress and compare results across trials. Some journals and funders also require registration as a condition for publication or funding, reinforcing the importance of this practice.