What gets collected
Studies record what they measure at visits: test results, scans, questionnaires and anything you report about how you feel. Many also ask permission to look at your past medical records, and some keep blood or tissue samples.
The consent form lists each kind of information. If something you expected is missing, or something surprises you, ask about it before you sign.
A code instead of your name
Most study records carry a code rather than your name. The site keeps the key that links the code to you, and the sponsor and other researchers usually see only the code.
This is sometimes called coding or pseudonymization. It lowers the chance of anyone outside the site knowing a result is yours, though it does not remove it entirely.
Who can see it
The study team at your site sees your full record. The sponsor sees coded data. Monitors checking the study is run properly, the ethics board that approved it and government regulators may look at records to confirm the research was done correctly.
In the United States, a separate permission called an authorization usually covers the use of your health information for the study. It may be part of the consent form or a page of its own.
Leaving, and what stays
You can leave a study at any time. When you do, the team stops collecting new information. Data already gathered is usually kept, because removing it could make the results unreliable.
Ask what happens to stored samples if you leave. Some studies will destroy them on request; others keep them in coded form.
Questions worth asking
Who will see information that has my name on it? How long are my records and samples kept? Could my samples be used for other research later, and would I be asked first? Will I get my own results?
Orva writes general information, not advice about your own health. Talk to your own doctor or the study team about anything that applies to you.
