Search the trial title in preprint servers and in PMC, then confirm that the record you find is labeled as a preprint before citing it as one. The NIH Preprint Pilot places eligible life-science preprints in PMC and PubMed with a preprint label, so the label itself is the check that separates a preprint record from a journal-published article.
- Run the trial title as a phrase search in the preprint server most likely to host the work. arXiv supports fielded and advanced search across titles, authors, abstracts, subjects, identifiers, and date ranges, so a title search can be narrowed by author or date range when the exact wording is uncertain. Expected result: a candidate record whose title matches the trial.
- Search the same title in PMC and in Europe PMC. Europe PMC supports keyword and fielded searches across life-science literature and preprints, with links to available full text. Expected result: either a matching record or no match, which leaves the preprint status unresolved for that database.
- Open the candidate record and read its status label. In PMC and PubMed, the NIH Preprint Pilot labels included preprints as preprints. Expected result: you can state whether the record is a preprint or a published article.
- Cite the preprint version you found and note its preprint status in the citation, including the server and the record identifier. Expected result: readers can tell which version you used and that it has not been through journal publication.
If the title search returns nothing, try the author names and the trial acronym, since title wording often changes between a manuscript and its preprint. A missing result in one database leaves the question open; repeat the search in the other preprint and literature sources before concluding that no preprint exists.