Prospective Clinical Trial Registration

Registration of a clinical trial in a public, WHO-recognized registry (for example ClinicalTrials.gov or another WHO ICTRP primary registry) at or before the date of first participant consent for enrollment — ICMJE's operative date is when the registry record was submitted, not when it was posted publicly. Registration submitted after enrollment has already begun is retrospective, not prospective, regardless of how far before manuscript submission it occurs.

ByCASRAI Editorial Board

· Last updated 16 Jul 2026

Worked examples

Is an instance

A Phase 2 drug trial submits its registration record — including primary and secondary outcome measures, target enrollment, and eligibility criteria — to ClinicalTrials.gov the week before recruitment opens; the registry's submission date establishes it as prospectively registered under ICMJE's policy.

Is an instance

A multi-country behavioral trial obtains a WHO Universal Trial Number and registers with a WHO ICTRP primary registry (for example ISRCTN) before the first participant signs a consent form, satisfying ICMJE's prospective-registration requirement even though recruitment across sites continues for months afterward.

Looks similar, but isn't

Not an instance

A trial begins enrolling participants in March, and its registry record isn't submitted until June, after several participants have already consented — this is retrospective registration. ICMJE does not treat it as satisfying the requirement, even though the record is public well before the manuscript is eventually submitted for publication.

Not an instance

A trial's design and eligibility criteria are logged only in an internal IRB protocol file or an institutional database that isn't publicly searchable — this fails ICMJE's registry-acceptability criteria (free, public, WHO-ICTRP-recognized) regardless of how early it was recorded relative to enrollment.

ICMJE has required prospective registration as a condition of consideration for publication in its member and follower journals since it announced the policy in September 2004, effective for trials beginning enrollment on or after 1 July 2005 (trials already enrolling by then had until 13 September 2005 to register). ICMJE treats the date a registry record was submitted, not the date it was posted publicly, as the operative timestamp — a record submitted before first patient consent counts even if the registry takes a few days to post it live.

This is a narrow, timing-specific standard: it governs one question (was the trial registered before or after enrollment began), not the full set of obligations a trial may separately owe. A trial can be prospectively registered under ICMJE’s policy and still be out of compliance with FDAAA 801’s 21-day registration deadline or its 12-month results-reporting deadline, since those are legally distinct requirements with their own scope and enforcement. See the clinical trial registration and reporting compliance guide for how prospective registration fits alongside FDAAA 801, NIH policy, ClinicalTrials.gov, and the WHO International Clinical Trials Registry Platform. See pre-registration for the broader reproducibility concept — committing to a study’s design before data collection — that prospective clinical trial registration is one specific, regulated instance of.

Use in your systems

JATS XML <role> element

xml

<role vocab="credit"
      vocab-identifier="https://casrai.org/dictionary/"
      vocab-term="Prospective Clinical Trial Registration"
      vocab-term-identifier="https://casrai.org/dictionary/term/prospective-clinical-trial-registration" />

Schema.org DefinedTerm (JSON-LD)

json

{
  "@context": "https://schema.org",
  "@type": "DefinedTerm",
  "@id": "https://casrai.org/dictionary/term/prospective-clinical-trial-registration",
  "name": "Prospective Clinical Trial Registration",
  "identifier": "https://casrai.org/dictionary/term/prospective-clinical-trial-registration",
  "description": "Registration of a clinical trial in a public, WHO-recognized registry (for example ClinicalTrials.gov or another WHO ICTRP primary registry) at or before the date of first participant consent for enrollment — ICMJE's operative date is when the registry record was submitted, not when it was posted publicly. Registration submitted after enrollment has already begun is retrospective, not prospective, regardless of how far before manuscript submission it occurs.",
  "inDefinedTermSet": "https://casrai.org/dictionary/domain/compliance-regulatory#set",
  "url": "https://casrai.org/dictionary/term/prospective-clinical-trial-registration",
  "sameAs": [
    "Prospective trial registration",
    "Prospective registration (clinical trials)"
  ],
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "publisher": {
    "@id": "https://casrai.org/#organization"
  },
  "dateModified": "2026-07-16T07:41:11",
  "inLanguage": "en"
}