Compass is still being developed and is effectively in beta. Some content and features may be incomplete, change, or not work as expected.

Content is anchored to trusted sources where available, but Compass has not yet been clinically reviewed. It provides general information rather than medical advice.

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Treatments and research

Eligibility criteria

The rules setting out who can and cannot join a particular study.

What it means

Written in advance, and usually covering time since diagnosis, a breathing measurement, a functional score, and which other treatments are allowed. They exist to make results interpretable, not to judge anybody, and they are the most common reason a trial is not open to someone.

Why you might hear it

  • It is the first thing to check on any trial listing.
  • Criteria sometimes change during a trial's life.

People who may help

Where Compass goes into this

About this explanation

These are plain explanations of words you may come across, not advice about your own situation. Where a word matters to a decision, the question pages go into it properly, and your own team is the place to take it.