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Clinical Trial Glossary: Plain-English Definitions
Every term you'll meet in a consent form or trial listing, defined in plain English: PICF, randomisation, washout, HREC, blinding and more.
By Charlotte Bradshaw27 August 2026
Why Was I Screened Out of a Clinical Trial?
Being screened out isn't a judgement on your health. The common reasons trials say no, what you're allowed to ask, and why the next study may fit.
27 August 20264 min read
Clinical Trial Phases 1, 2, 3 and 4 Explained
The four phases of a clinical trial: what each one tests, who takes part, how big they are and how long they run. All of it in one table.
27 August 20264 min read
Can I Withdraw From a Clinical Trial After I've Started?
Yes, at any time, without giving a reason, and your regular care isn't affected. How to withdraw safely and what happens to your data and payment.
27 August 20264 min read
Will I Get a Placebo in a Clinical Trial?
Not always. Many trials compare a new treatment against standard care, and you're told your placebo odds before you consent. Here's how it works.
27 August 20265 min read