- Start with ClinicalTrials.gov
- For cancer, start with the NCI trial finder
- How to read a trial listing
- Use disease-specific advocacy organizations
- Check academic medical center listings
- NIH ResearchMatch and other matching services
- Ask your treating physicians
- Evaluating which trials to consider
- Reading eligibility criteria carefully
- Contacting trial coordinators
- Informed consent and your rights as a participant
- Frequently Asked Questions
- Are clinical trials free for participants?
- How do I know if a trial is legitimate?
- Can I participate in trials remotely?
- How long does the screening process take?
- Should I tell my doctor I’m considering a trial?
- The bottom line on finding clinical trials
- Related guides
- Sources
Finding a clinical trial that fits your condition, location, and circumstances is a research project in itself. The largest US database, ClinicalTrials.gov, lists well over 500,000 studies — far more than any individual could review. The right approach is layered: use ClinicalTrials.gov as your primary search, supplement it with disease-specific advocacy organizations and academic medical center listings, and consult your treating physicians. This guide covers how to find clinical trials efficiently, how to read a listing, how to evaluate which trials to consider, and what to understand about consent and your rights before you enroll. The short version: combine multiple resources, start broad and filter aggressively, don’t self-disqualify based on a first read of the eligibility criteria — and involve your own doctor before you join a trial or change any treatment. This article is general education, not medical advice.
Start with ClinicalTrials.gov
The federal database ClinicalTrials.gov, maintained by the U.S. National Library of Medicine (part of the NIH), is the most comprehensive starting point. Search by your condition, filter to “Recruiting” status and your geographic area, and review the listings systematically. The redesigned site has clearer filters and more readable trial summaries than the older interface.
For effective searches:
- Enter the medical condition name in the “Condition/disease” field (try synonyms and both the common and clinical names)
- Add country, state, and distance filters to focus on sites you can reach
- Filter to “Recruiting” (and “Not yet recruiting” if you want to plan ahead)
- Filter by phase if you have preferences (Phase 3 for treatments already showing promise; Phase 1–2 for earlier-stage, more experimental therapies)
- Sort by newest to surface recently added trials
For more detailed search guidance, see our ClinicalTrials.gov guide.
For cancer, start with the NCI trial finder
If you are searching for a cancer trial, the National Cancer Institute (NCI) — part of NIH — runs a dedicated trial search at cancer.gov that many patients find easier to navigate than the general database. It lets you search by cancer type, stage, and location, and it draws on a curated set of NCI-supported trials. The NCI also operates a contact center that can help you and your caregivers search and understand your options. Because NCI and ClinicalTrials.gov cover overlapping but not identical listings, checking both is worthwhile for cancer.
How to read a trial listing
Once you find promising results, knowing how to read a listing saves time. Each ClinicalTrials.gov record includes several fields worth checking closely:
- Recruitment status: whether the study is recruiting, not yet recruiting, active but not recruiting, or completed.
- Study phase and type: interventional (testing a treatment) versus observational, and the phase.
- Eligibility criteria: the inclusion and exclusion criteria, plus age and sex requirements.
- Locations: the participating sites and cities, so you can gauge travel.
- Contacts: the study coordinator or contact person for each site.
- Study design and outcomes: what the study measures and, often, whether there is a placebo or comparison group.
Reading these fields together gives you a realistic picture of whether a trial fits before you ever pick up the phone.
Use disease-specific advocacy organizations
For most conditions, patient advocacy organizations maintain curated lists of relevant trials. These lists are often more focused than a raw database search and add helpful context about which trials matter and which are recruiting.
Examples include:
- Alzheimer’s Association: TrialMatch service for Alzheimer’s and dementia trials
- American Cancer Society: clinical trial matching for many cancer types
- Crohn’s & Colitis Foundation: IBD-specific trial listings
- Breakthrough T1D (formerly JDRF): type 1 diabetes research and trial information
- Michael J. Fox Foundation: Parkinson’s disease trial matching
- National Multiple Sclerosis Society: MS trial resources
For your specific condition, search “[condition name] foundation clinical trials” or “[condition name] association research” to find the relevant organization.
Check academic medical center listings
Major academic medical centers run extensive clinical research and maintain their own trial listings. These are often the sites for cutting-edge cancer trials, rare disease research, and early-phase studies of novel therapies.
US academic centers with large clinical research programs include:
- Mayo Clinic (Rochester, MN; Phoenix, AZ; Jacksonville, FL)
- Memorial Sloan Kettering Cancer Center (New York)
- MD Anderson Cancer Center (Houston)
- Johns Hopkins (Baltimore)
- Massachusetts General Hospital and Brigham and Women’s (Boston)
- Cleveland Clinic (Cleveland, plus other locations)
- UCSF (San Francisco) and Stanford Medicine (California)
- NIH Clinical Center (Bethesda, MD)
For local options, check your nearest university medical center’s clinical research website — most have searchable databases of active trials.
NIH ResearchMatch and other matching services
ResearchMatch is an NIH-supported, nonprofit service that connects volunteers with researchers across many institutions. You create a profile with your medical history, and researchers reach out when their studies match. It is free and non-binding — you decide whether to engage when contacted.
Other matching services include Antidote Match, CenterWatch, and various sponsor-run registries. These can surface trials that a condition-based search misses, particularly when your profile fits niche eligibility criteria. Treat any service’s marketing claims skeptically and confirm that a study is registered on ClinicalTrials.gov before you share detailed personal information.
Ask your treating physicians
Your specialist or primary care physician is often a valuable source for trials relevant to your condition. Specialists at academic centers frequently know about studies at their institution; community physicians may hear about regional trials through their networks.
Questions to ask your physician:
- “Are there clinical trials at this institution I might qualify for?”
- “Do you know of trials at nearby academic centers I should look into?”
- “Would you support my participation if I find a trial that interests me?”
- “Could you provide records or referrals if a trial requires them?”
Your physician’s involvement matters because some trials require physician referrals or medical records, and coordinators often need to verify details of your history that your treating physician documents. Just as important, your doctor can help you weigh whether a trial fits your overall care.
Evaluating which trials to consider
Not every trial you qualify for is the right trial for you. Factors to weigh:
Phase: Phase 3 trials study treatments that have already shown promise; Phase 1–2 trials offer earlier access to novel therapies but with more uncertainty about safety and benefit.
Risk and benefit: Potential benefits (access to a treatment, close monitoring, contributing to research) versus risks (side effects, time and travel, and the possibility of being assigned to a placebo or standard-care group).
Time commitment: How many visits, how long, and where. Can you realistically keep the schedule?
Standard treatment alternatives: Are there established treatments you have not tried? Trials are often most appropriate when standard options are limited or have not worked — a judgment to make with your doctor.
Sponsor and site quality: Trials at major academic centers typically have robust oversight, and all registered trials must follow their approved protocol and ethics review.
Reading eligibility criteria carefully
Eligibility criteria are the gating factor. Read them carefully but don’t self-disqualify too quickly — some criteria look strict, yet a study coordinator can sometimes clarify or accommodate variations within the protocol.
Common categories of eligibility criteria:
- Demographic (age, sex, and sometimes population-specific factors)
- Disease-specific (confirmed diagnosis, severity, duration)
- Lab values (kidney and liver function, blood counts)
- Medication-related (current drugs that might interfere)
- Comorbidity (other conditions that could affect the study or your safety)
If you appear to meet most criteria, contact the study coordinator and ask. They can tell you definitively whether you can be screened for enrollment.
Contacting trial coordinators
Each listing includes contact information for the study coordinators at each site. Reaching out is straightforward:
- Email or call the listed contact
- Briefly describe your condition and why you’re interested
- Confirm whether the trial is currently recruiting
- Ask about the specific eligibility questions you have
- Ask what the screening process involves
Coordinators handle these inquiries regularly and will either schedule a screening visit or tell you clearly that you don’t qualify.
Informed consent and your rights as a participant
Before you enroll in any trial, you go through informed consent: the research team must explain the study’s purpose, what will happen, how long it lasts, the reasonably foreseeable risks and potential benefits, any alternatives (including standard care), and how your privacy is protected. Take the consent document home, read it, and ask questions — signing is not a rushed formality, and you should not feel pressured.
Two rights are worth emphasizing. First, participation is voluntary, and you can withdraw at any time, for any reason, without penalty and without losing your regular medical care. Second, a clinical trial is research, not guaranteed treatment. The intervention may not help you, some studies use a placebo or compare against standard care, and the goal is to answer a scientific question. Registered trials in the US are overseen by an Institutional Review Board (IRB) that reviews the study for participant safety and ethics. If anything about a study feels unclear or high-pressure, that is a reason to slow down and talk it through with your own doctor.
Frequently Asked Questions
Are clinical trials free for participants?
The trial-related procedures, study drug, and study visits are typically provided at no charge, and some trials reimburse travel and lodging. Your routine medical care usually continues to be billed to insurance as normal. Ask the coordinator exactly what the study covers and what you might owe before you enroll.
How do I know if a trial is legitimate?
Trials registered on ClinicalTrials.gov and overseen by an IRB are legitimate research studies. Be cautious of studies recruiting through social media or ads without ClinicalTrials.gov registration, and never pay to “buy in” to a legitimate trial.
Can I participate in trials remotely?
Some trials are decentralized, meaning some visits happen at home or at a local lab rather than the main site. The number of decentralized trials has grown. See our decentralized clinical trials guide, and ask whether telehealth visits are an option.
How long does the screening process take?
Initial screening calls take about 15–30 minutes. Full screening visits (history, exam, labs) usually take 1–2 hours. Time from first contact to enrollment is commonly 1–4 weeks, depending on how complex the screening is.
Should I tell my doctor I’m considering a trial?
Yes — before you join or change any treatment. Your treating physician can coordinate your care, provide records if needed, help you weigh the risks and benefits, and keep managing your condition. Talking with your doctor first is part of making a safe, informed decision.
The bottom line on finding clinical trials
Finding clinical trials is a multi-resource process. Start with ClinicalTrials.gov for comprehensive search (and the NCI finder for cancer), supplement with disease-specific advocacy organizations and academic medical center listings, and use matching services like ResearchMatch to widen your reach. Learn to read a listing, evaluate trials on phase, risk and benefit, time commitment, and your standard-treatment alternatives, and don’t self-disqualify — contact coordinators to clarify. Understand informed consent and your right to withdraw, remember that research is not guaranteed treatment, and involve your own doctor before joining a trial or changing treatment. The right trial for you may take some searching, but the resources to find it are extensive and freely accessible. For more on managing your condition overall, see our medical conditions resource hub.
Medical disclaimer: This article is general education, not medical advice, and it is not a recommendation to join any particular study. A clinical trial is research, not guaranteed treatment; benefits are not assured, and some studies involve a placebo. Talk with your own doctor before joining a trial or making any change to your current treatment, and read the full informed-consent document and ask questions before enrolling. Participation is voluntary, and you can withdraw at any time without losing your regular care. Confirm that any study is registered on ClinicalTrials.gov and IRB-overseen. For a medical emergency, call 911.
Sources
- ClinicalTrials.gov — U.S. National Library of Medicine (National Institutes of Health)
- National Cancer Institute (NCI) — Clinical trials search and Cancer Information Service
- National Institutes of Health (NIH) — ResearchMatch
- NIH / National Library of Medicine — Learn about clinical studies; informed consent and participant rights
