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A practical introduction to clinical research participation, including how studies are organized, what screening involves, and how to assess fit before you apply.

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What clinical research is

Clinical research evaluates health-related questions using a defined study plan (the protocol). Some studies observe participants, while others test an intervention such as a medication, device, or behavioral program.

  • Observational studies: questionnaires, monitoring, or example collection.
  • Interventional studies: involve a study treatment, device, or structured intervention.
  • Protocol-driven scheduling: visits and procedures are pre-defined.
  • Eligibility criteria: enrollment depends on inclusion and exclusion requirements.

How participation usually begins

  1. Identify a study through a registry, research site, referral, or advertisement.
  2. Complete a pre-screen by phone or online form.
  3. Attend screening for consent review and eligibility assessment.
  4. Receive enrollment decision (eligible/not eligible).
  5. Participate in visits and required follow-up activities.
  6. Complete close-out or final follow-up as required.

Practical point: the listing is only a starting point. The visit schedule and procedure list determine the actual burden.

Common study types and participant experience

Compensation and participant burden often increase together.

Study typeTypical participant activitiesPractical considerations
ObservationalSurveys, wearables, examples, check-insOften lower burden; compensation may be limited
Patient interventionalTreatment/device visits, monitoring, symptom trackingMay align with care but can involve frequent procedures
Healthy volunteer / early-phaseLabs, timed visits, monitoring, possible overnight staysHigher burden and stricter timing; compensation may be higher
Remote / digitalTele-visits, app diaries, home kitsLess travel, but compliance windows can be strict

Starter glossary

  • Protocol: the official study plan.
  • Screening: assessment to determine eligibility.
  • Consent form: document describing procedures, risks, benefits, and rights.
  • Randomization: assignment to a study group by chance.
  • Placebo: inactive comparison used in some studies.
  • Adverse event (AE): an unwanted medical event or side effect.
  • Follow-up: post-visit monitoring required by protocol.

Pre-application checklist

  1. Can you reliably attend visits and follow-ups?
  2. What is the realistic travel/parking burden?
  3. Are you comfortable with the likely procedures (labs, imaging, fasting, diaries)?
  4. Will the protocol conflict with work, caregiving, or other obligations?
  5. Do you have a way to track contacts, dates, and compensation records?
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