Understanding your rights before, during, and after participation in a U.S. clinical trial. According to ClinicalTrials.gov, the NIH registry maintained by the National Library of Medicine contains more than 500,000 studies in more than 220 countries. The 2007 FDAAA requires registration for most FDA-regulated studies. Patient rights are protected by 21 CFR Part 50 (informed consent) and 45 CFR 46 (the federal Common Rule); see our methodology for source documents.
Your rights don't change, but who enforces them can
30% of the 22,403 currently recruiting trials with a listed US site run across more than one state, which means your consent, withdrawal and privacy rights are the same everywhere but the IRB of record enforcing them is specific to your enrolling site.
- 30%
- of recruiting trials list sites in 2+ states
- 6,698
- multi-state recruiting trials
- 22,403
- currently recruiting trials with a US site
Rights are federal (45 CFR 46 / 21 CFR 50) and identical regardless of site count; the IRB of record is local to your enrolling site and must be named in your consent form.
Participant rights at a glance
The four core rights below are not symbolic. Each is enforceable under a specific federal regulation and overseen by a specific authority. The table below maps each right to its regulatory source and the authority that enforces it.
| Right | Regulatory source | Enforcement authority |
|---|---|---|
| Informed consent | 45 CFR 46 / 21 CFR 50 | OHRP and FDA |
| Voluntary withdrawal | 45 CFR 46.116 | IRB of record |
| Privacy of health information | HIPAA Privacy Rule | HHS Office for Civil Rights |
| Continued medical care | Common Rule + IRB protocol | IRB and institution |
You can leave a clinical trial at any time, for any reason, without penalty or loss of your ordinary medical care, that right is federal law, not courtesy.
Your Core Rights as a Trial Participant
The rights of clinical trial participants are protected by federal regulations, the Belmont Report principles, and institutional review boards (IRBs). Whether you're considering enrollment or already participating, you have fundamental protections.
The Right to Informed Consent
Before you can join a clinical trial, researchers must explain:
- The purpose of the study
- What you'll be asked to do and how long it will take
- All foreseeable risks and discomforts
- Potential benefits to you or others
- Alternative treatments outside the trial
- How your confidentiality will be maintained
- Whether compensation or treatment is available if injury occurs
- Contact information for questions
The regulations require time to review the document, ask questions, and decide without coercion; 21 CFR 50.27 further requires that a copy of the signed consent form be given to the person signing it.
The Right to Withdraw
You may leave a clinical trial at any time, for any reason, without penalty or loss of benefits to which you're otherwise entitled. Participation is always voluntary. Withdrawing from a trial will not affect your regular medical care.
The Right to Privacy
Your personal health information is protected under HIPAA. Researchers must maintain the confidentiality of your data. In published results, you are identified by a participant number, never by name. The FDA and sponsor may review your records for audit purposes, this should be disclosed in your consent form.
The Right to Continued Care
Participating in a trial does not replace your regular healthcare. You retain the right to continue seeing your regular physician. If you experience adverse effects, the trial team must provide medical care or refer you to appropriate care.
Questions to Ask Before Enrolling
Before signing a consent form, consider asking:
- What is the purpose of this study?
- Has this treatment been tested in earlier phases? What were the results?
- What are the known side effects?
- What are the alternatives to participating?
- Will I know which group I'm in (treatment or placebo)?
- What happens if I experience side effects?
- Who will cover costs if I'm injured in the trial?
- Can I continue if the trial ends early?
- What happens to my data if I withdraw?
The Role of Institutional Review Boards (IRBs)
Every federally funded clinical trial must be reviewed and approved by an Institutional Review Board (IRB) - an independent committee that includes researchers, physicians, and community members. The IRB evaluates whether the study is ethical and whether the risks are reasonable compared to the benefits.
When IRB judgment shapes the trial
IRB review is not a one-time approval. The board continues monitoring as the trial runs, reviews protocol amendments, evaluates safety reports, and can suspend or terminate research that loses its risk-benefit justification. Participants who flag concerns to the IRB trigger this oversight even when the research team is dismissive.
Central IRBs for multi-site trials
Large multi-site trials often use a single central IRB rather than relying on each participating institution's local board. Central IRBs streamline approval and harmonize protocol oversight across sites, but participants should still know which IRB is the IRB of record for their specific enrollment site, the contact information is required to be in the consent form.
Of the 22,403 currently recruiting trials that list at least one US study site, 6,698 (30%) list sites in more than one US state. That is the multi-site scenario described above, although the registry record alone does not identify the IRB of record. The remaining 70% do not list sites in more than one US state.
Before you sign a consent form
Site count changes who to contact, not what you're owed.
- Ask which IRB is the IRB of record for your specific enrolling site, it must be named in the consent form regardless of how many other states the trial runs in. Search recruiting trials
- A multi-site trial gives you more location options if you need to relocate mid-study, ask whether your data and continued participation transfer between sites. Browse trials by state
- Your right to withdraw applies at every site the trial runs, not just the one where you enrolled. Read the informed-consent guide
Site-count figures come from registry location fields; the IRB of record for your enrollment must still be confirmed in your own consent document.
Reporting Concerns
If you believe your rights have been violated or you have concerns about the trial, you can contact:
- The IRB that oversees the study (contact info should be in your consent form)
- The Office for Human Research Protections (OHRP): hhs.gov/ohrp
- The FDA MedWatch program for reporting adverse events: fda.gov/safety/medwatch
Seek Legal or Advocacy Support
If you believe you've been harmed by a clinical trial, consider consulting an attorney specializing in medical research. Patient advocacy organizations like the National Patient Advocate Foundation can also provide guidance.
Participation in a clinical trial is voluntary, and the right to withdraw at any time cannot be waived. Trials that pressure continued participation violate the most fundamental rule in human-subjects research.