What happens at a clinical trial screening visit?
What to bring to a clinical trial screening visit, the tests involved, how long it takes and common reasons people don't qualify.
6 min read · Informational only, not medical advice.
What screening is for
A screening visit checks whether you meet the study's eligibility criteria before you start.
It also protects your safety: the team looks for anything that would make the study treatment risky for you. You may answer a few pre-screening questions by phone or online first, but tests done only for the study happen after you sign the consent form, so you'll have time to ask questions first.
What to bring
Bring a photo ID, your insurance card, a list of every medicine and supplement you take, and any recent test results or records the team asked for.
It also helps to bring the names of your doctors, a list of past surgeries or major illnesses, and your questions written down. Some people bring a friend or family member for support.
Tests you might have
Common screening tests include a physical exam, vital signs, blood and urine tests, and questions about your health history.
Depending on the study, you may also have an ECG (heart tracing), imaging such as an X-ray or MRI, a pregnancy test, or questionnaires about your symptoms. Some studies need a recent biopsy or scan.
How long it takes
A screening visit often takes a few hours, and some studies need more than one visit.
Ask whether you need to fast beforehand, whether the visit is paid or reimbursed, and how soon you'll hear the results. Test results can take days or a few weeks.
What can disqualify you
Common reasons for not qualifying include lab results outside the study's range, another health condition, a medicine you take, or recent treatment for your condition.
Not qualifying is common and says nothing bad about you. The criteria are written to protect participants and to answer a specific research question.
After screening
If you qualify, the team will schedule your first study visit. If you don't, ask whether the reason might change later, and ask for copies of your test results, if available, to share with your own doctor. You can then look for other studies that may suit you better.
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Quick answers
- What is a clinical trial screening visit?
- A screening visit checks whether you meet the study's eligibility criteria before you start.
- What should I bring to a screening visit?
- Bring a photo ID, your insurance card, a list of every medicine and supplement you take, and any recent test results or records the team asked for.
- What tests happen at a screening visit?
- Common screening tests include a physical exam, vital signs, blood and urine tests, and questions about your health history.
- How long does a screening visit take?
- A screening visit often takes a few hours, and some studies need more than one visit.
- What can disqualify me during screening?
- Common reasons for not qualifying include lab results outside the study's range, another health condition, a medicine you take, or recent treatment for your condition.
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