This article is for informational purposes only and does not constitute medical advice. Clinical trial eligibility and availability vary. Always consult a qualified healthcare professional before making any medical decisions or considering participation in a clinical trial.
Summary
Joining a clinical trial involves finding a study you may qualify for, contacting the research team, going through a screening process, signing informed consent, and participating in study visits over the trial period. This guide walks through each step so you know what to expect before committing.
Step 1: Find a Trial
The primary source of all registered clinical trials is ClinicalTrials.gov, maintained by the NIH's National Library of Medicine. Every trial conducted in the US — and most international trials — must be registered here. You can search by condition, location, age, and status (look for "Recruiting").
ClinicalMetric aggregates the same database with a cleaner interface, AI-powered summaries, and condition-based filtering. Other tools include ResearchMatch.org (a patient-researcher matching service), your condition's advocacy organization trial finder, and your doctor's referral network.
When searching, try variations of your condition name. "Type 2 diabetes" may also appear as "T2DM," "non-insulin-dependent diabetes," or specific complications ("diabetic kidney disease"). Broader searches yield more results.
Step 2: Review Eligibility Criteria
Every trial has inclusion and exclusion criteria — a list of requirements that define who can participate. These typically include: age range, diagnosis and disease stage, medical history requirements, current medication restrictions, lab value ranges, and geographic constraints.
Read the eligibility criteria carefully before contacting the study team. If you're unsure whether you qualify, contact the team anyway — many criteria are more flexible than they appear in writing, and the research coordinator can clarify quickly.
Step 3: Contact the Research Team
Each trial listing includes contact information for the research coordinator or principal investigator. Email or call to express interest. Be prepared to provide basic information: your diagnosis, current medications, recent lab results if available, and your location.
The research coordinator will do a brief pre-screen — usually 15–30 minutes by phone — to determine if you appear to meet the key eligibility criteria. This is not a commitment; it's just an initial assessment.
Step 4: Attend a Screening Visit
If you pass the pre-screen, you'll be invited for a formal screening visit at the research site. This typically includes: a physical examination, blood and urine tests, an electrocardiogram (ECG), review of medical records, and condition-specific assessments (imaging, cognitive tests, etc.).
Screening results determine whether you meet all eligibility criteria. Some people pass pre-screening but are excluded at formal screening based on lab values or test results. This is normal — roughly 30–50% of people who attend screening visits are ultimately enrolled.
Step 5: Informed Consent
Before any study procedures begin, you must sign an informed consent form (ICF). This document — sometimes 20–40 pages — describes the study purpose, procedures, potential risks and benefits, your rights as a participant, and what happens to your data.
Take time to read it thoroughly. Ask every question you have — the research team is required to answer. You can take the form home and review it with family or your personal physician before signing. Signing informed consent does not obligate you to continue; you can withdraw at any time.
Step 6: Study Participation
Once enrolled, you'll attend study visits according to the protocol schedule — which may be weekly, monthly, or quarterly depending on the trial. Visits typically include: receiving study treatment (drug, device, or procedure), safety assessments, laboratory tests, and completing questionnaires.
You're expected to report any new symptoms or changes in health to the study team promptly. Keep a list of all medications and supplements you take — some may interact with the study drug or be prohibited by protocol.
Your Rights as a Participant
- You can withdraw from the trial at any time, for any reason, without penalty
- You have the right to receive all information relevant to your participation
- Your participation is confidential — your identity is protected in all publications
- You will be informed of any new safety information that emerges during the trial
- You will receive care if you experience trial-related injury