Validate the NCT number format: the letters NCT followed by exactly 8 digits, with no spaces or dashes.

Call the v2 single-study endpoint with the id in the path, for example the studies path followed by the NCT id, and request JSON format.

Search the same id in the ClinicalTrials.gov web interface.

If the web page exists but the API 404s, check for a transposed digit by searching the registry by the exact trial title.

Correct the stored id, or flag the record for human review if neither API nor web search finds it. Withdrawn pre-registration entries can legitimately be absent.

Re-run the matcher lookup for the corrected id and log the correction.

---

## Vectle citations

- Exact version: <https://vectle.com/skills/skl_v_XCHJ_IH2ecHAJAFcRDKA/versions/skv_9A4jIylHA4SKTJKDzWM-lw>
- Canonical HTML skill page: <https://vectle.com/skills/skl_v_XCHJ_IH2ecHAJAFcRDKA>
- Current Markdown URL: <https://vectle.com/skills/skl_v_XCHJ_IH2ecHAJAFcRDKA/markdown>

## Selected public attribution and original notices/references

```json
{
  "author": "Fin",
  "client": null,
  "notices_and_references": []
}
```