Comprehensive Clinical Trial Database and Research Registry for Medical Studies
ClinicalTrials.gov is a free, publicly accessible database maintained by the U.S. National Library of Medicine that provides detailed information on clinical trials worldwide, allowing users to search, register, and review study results.
- Best for
- Clinical Trial Search
- Key capability
- Extensive Clinical Trial Registry
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What is ClinicalTrials.gov?
ClinicalTrials.gov is a publicly accessible, comprehensive database of privately and publicly funded clinical studies conducted around the world. Maintained by the U.S. National Library of Medicine, it serves as a registry and results database to promote transparency, patient access, and research collaboration in clinical trials.
Key features of ClinicalTrials.gov
The platform offers advanced search capabilities, detailed trial records, study registration tools, results reporting, and resources for patients and professionals to navigate clinical research.
Extensive Clinical Trial Registry
Includes over 450,000 studies from around the world covering a wide range of diseases and conditions.
Advanced Search Filters
Filter by study phase, recruitment status, location, intervention type, and more.
Results Database
Access posted results summaries for many completed trials.
Patient and Caregiver Resources
Educational materials and guidance to help understand clinical trials and participation.
Regulatory Compliance Support
Facilitates adherence to FDAAA 801 and ICMJE requirements for trial registration and reporting.
Pros and cons of ClinicalTrials.gov
Pros
- Comprehensive and authoritative clinical trial data
- Free and publicly accessible platform
- Supports regulatory transparency and compliance
- Detailed and structured trial information
- Useful for patients, researchers, and clinicians
Cons
- Interface can be complex for casual users
- Limited to English language content
- No direct patient enrollment or matchmaking service
Key use cases for ClinicalTrials.gov
Clinical Trial Search
Researchers, healthcare professionals, and patients can search for ongoing and completed clinical trials by condition, location, intervention, and other criteria.
Study Registration
Clinical trial sponsors and investigators can register their studies to comply with regulatory requirements and increase transparency.
Data Access and Analysis
Users can access detailed information about trial design, enrollment, outcomes, and results to support evidence-based medicine and research.
Patient Recruitment
Patients and caregivers can find trials that may be relevant for participation based on eligibility criteria and geographic location.
Regulatory Compliance
Helps sponsors meet FDA and international mandates for clinical trial disclosure and reporting.
How ClinicalTrials.gov works
- 1
Search for Trials
Users enter keywords, conditions, or locations to find relevant clinical studies.
- 2
Review Study Details
Access comprehensive information including eligibility, study design, locations, and contact information.
- 3
Register a Study
Researchers submit trial information through an online protocol registration system to list their study.
- 4
Report Results
Sponsors can upload summary results to comply with regulatory requirements and inform the public.
Who is using ClinicalTrials.gov
ClinicalTrials.gov pricing
Free
$0
Full access to search, register, and report clinical trials without any cost.
Plans and prices are as published by the vendor and can change. Check the official site before you buy. Open the pricing page (opens in a new tab)
Frequently asked questions about ClinicalTrials.gov
Anyone can search for clinical trials, including patients, caregivers, researchers, and healthcare professionals.
No, ClinicalTrials.gov is freely accessible to the public.
The database is updated daily as new studies are registered and results are posted.
You can contact study organizers directly using the information provided to inquire about participation.
Some tools offer a free plan or trial with limited features. Availability can vary, so confirm on the official website.
Some tools offer a free plan or trial with limited features. Availability can vary, so confirm on the official website.
Some tools offer a free plan or trial with limited features. Availability can vary, so confirm on the official website.
Some tools offer a free plan or trial with limited features. Availability can vary, so confirm on the official website.
Conclusion
A search of the ClinicalTrials.gov registry starts with keywords, conditions or locations, and filters narrow results by study phase, recruitment status, location and intervention type. Each study record gives eligibility, study design, locations and contact information, and many completed trials also have posted results summaries. Patients and caregivers can find trials relevant for participation based on eligibility criteria and geographic location, supported by educational materials about clinical trials. The registry includes over 450,000 studies from around the world covering a wide range of diseases and conditions. Its users range from medical researchers and healthcare professionals to patients, caregivers and pharmaceutical companies.
Registration is the other half of the database. Researchers submit trial information through an online protocol registration system, and sponsors upload summary results to comply with requirements such as FDAAA 801 and ICMJE. Maintained by the U.S. National Library of Medicine, the database is updated daily and is freely accessible to the public.
It offers no direct patient enrollment or matchmaking service, so anyone interested in a trial contacts the study organizers directly using the information provided. The interface can also be complex for casual users.
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