Centralized and decentralized clinical trials differ mainly in where study activities happen. Centralized trials bring participants to a traditional research site. Decentralized clinical trials move some or all activities to participants' homes, local health care facilities, or other convenient locations.
Neither model is automatically better. The right approach depends on the intervention, endpoints, participant population, safety requirements, and the procedures needed to collect reliable data.
What Is a Centralized Clinical Trial?
A centralized clinical trial is organized around one or more traditional research sites. Participants travel to those sites for activities such as screening, consent, product administration, laboratory testing, assessments, and follow-up visits.
This structure gives the study team direct control over procedures and equipment. It is often appropriate when an intervention requires complex administration, specialized imaging, close medical supervision, or assessments that cannot be performed reliably at home.
The tradeoff is participant burden. Travel, time away from work, transportation, caregiving responsibilities, and distance from the study site can all affect who is able to enroll and remain in the study.
What Is a Decentralized Clinical Trial?
The FDA describes a decentralized clinical trial as a trial in which some or all trial-related activities occur somewhere other than a traditional clinical trial site. Those activities may happen in a participant's home, through telehealth, with a local health care provider, or at a local laboratory.
Decentralization is not an all-or-nothing choice. A study might collect daily wearable data and participant-reported outcomes remotely while retaining an in-person screening visit or a locally administered laboratory test.
Common decentralized elements include:
Remote Participation
Recruitment, prescreening, electronic informed consent, and telehealth visits can reduce the need for travel.
Wearables and Apps
Connected devices, mobile applications, and electronic surveys can collect prespecified measures between visits.
Product Delivery
When appropriate, study products can be shipped directly to participants with adherence and safety procedures built into the protocol.
Local or At-Home Labs
Samples may be collected at home or through qualified local facilities when the protocol and oversight plan support it.
Centralized vs Decentralized Clinical Trials at a Glance
| Study element | Centralized trial | Decentralized trial |
|---|---|---|
| Participant location | Traditional research site | Home, local facility, telehealth, or a combination |
| Study visits | Primarily in person | Remote when appropriate, with local or in-person visits when needed |
| Data collection | Site equipment and scheduled assessments | Wearables, apps, surveys, connected devices, local labs, and remote assessments |
| Geographic reach | Often limited by travel distance | Can recruit across a broader geographic area |
| Participant burden | Travel and fixed appointments may be required | Fewer site visits can make participation easier |
| Oversight | Site-based investigator and study team | Investigator oversight remains, with added coordination across remote activities |
| Best suited for | Complex procedures, intensive supervision, specialized equipment | Remote-friendly interventions and outcomes measured in daily life |
| Primary operational risk | Site access and recruitment bottlenecks | Technology access, data completeness, logistics, and remote coordination |
Benefits of Decentralized Clinical Trials
Broader Participant Access
Reducing the need for frequent travel can make a study accessible to people who live far from a research site, have limited mobility, work full time, or manage caregiving responsibilities. A broader recruiting area may also help a study reach a population that better reflects the people who use the product.
Data From Daily Life
Many health and wellness outcomes happen outside a clinic. Sleep, physical activity, resting heart rate, heart rate variability, and participant-reported symptoms can be measured repeatedly in a participant's normal environment.
Lower Participant Burden
Remote check-ins, product delivery, and at-home data collection can reduce the time and travel required from participants. A well-designed remote experience may support adherence and retention, but those outcomes still depend on clear instructions and responsive support.
More Frequent Measurement
Site visits provide snapshots. Connected devices and short digital assessments can collect repeated measurements between visits, helping a study examine trends, variability, and change over time.
Remote measurement still requires prespecified endpoints, consistent collection windows, device-selection criteria, and a plan for missing or irregular data.
Limitations and Risks of Decentralized Trials
Technology and Access
Device compatibility, technical support, digital literacy, phone access, and internet connectivity should be addressed before recruitment begins.
Data Quality and Missingness
The protocol should define wear-time requirements, adherence thresholds, support triggers, and how missing data will be handled in the analysis.
Operational Coordination
Local labs, remote staff, shipments, telehealth visits, and data vendors still require documented responsibilities, training, oversight, and quality control.
Privacy and Security
Teams should understand what each platform collects, where information is stored, who can access it, and how it moves between systems.
When Is a Centralized Study the Better Choice?
A traditional site-based model may be preferable when the study requires:
- Complex product preparation or administration
- Specialized imaging or equipment
- Procedures performed by trained clinical personnel
- Close observation after an intervention
- Frequent physical examinations
- Intensive in-person participant support
Some studies combine site-based procedures with remote follow-up. The design should follow the scientific and safety needs of the study rather than a preference for a particular delivery model.
Decentralized Studies for Supplements and Wellness Products
Supplements, wearable devices, digital health products, and behavioral interventions are often used in everyday settings. That makes them strong candidates for remote study elements when the outcomes can be measured reliably outside a traditional site.
A decentralized supplement study might include direct shipment of the study product, daily adherence tracking, validated participant-reported outcomes, wearable data, and optional at-home or local laboratory testing. A device study might measure sleep, activity, recovery, or other prespecified endpoints while participants use the product in their normal routines.
The design still needs a clear research objective, a suitable comparison, defined endpoints, an analysis plan, appropriate oversight, and a participant experience that supports consistent data collection.
Regulatory and Oversight Considerations
Remote does not mean unregulated or unsupervised. The FDA's September 2024 final guidance on clinical trials with decentralized elements addresses investigator oversight, remote visits, local health care providers, digital health technologies, investigational product handling, safety monitoring, informed consent, and data management.
The specific requirements depend on the study, product category, intended use of the results, participant risk, and applicable regulations. Regulatory, IRB, privacy, and claims considerations should be evaluated during study design rather than added after recruitment begins.
How Reputable Health Runs Decentralized Research
Reputable Health designs and runs studies for health and wellness products using remote recruitment, participant engagement, wearable data, validated surveys, biomarkers, and at-home laboratory options when appropriate.
The process begins by matching the study design to the product, target population, intended outcomes, and evidence goals. The team then coordinates recruitment, data collection, participant support, analysis, and reporting through one study plan.
Explore Reputable Health's clinical research services, review its study capabilities, or start with a pilot study.
Frequently Asked Questions
Are decentralized clinical trials completely remote?
Not necessarily. A decentralized trial can move some or all activities away from a traditional research site. Some studies still include an in-person screening, local laboratory visit, or site-based procedure.
Are decentralized clinical trials regulated differently?
Using remote elements does not remove the responsibilities that apply to the study. The applicable requirements depend on the intervention, study purpose, risk, and intended use of the data. Oversight, informed consent, safety monitoring, and data integrity still need to be addressed.
What technology is used in decentralized trials?
Common tools include electronic consent, telehealth, mobile applications, electronic surveys, wearable devices, connected sensors, and remote data platforms. Technology should be selected based on the protocol and participant population.
Can consumer wearables be used in clinical research?
Consumer wearables can support research when the device, metric, collection schedule, and analysis plan fit the study objective. Researchers should understand the device's limitations, software changes, data-access rules, and the difference between consumer metrics and endpoints intended for a regulated submission.
Which trial model is best for a wellness product?
It depends on the product and endpoints. Products used at home and outcomes measured in daily life may be well suited to decentralized elements. Studies requiring specialized procedures or intensive supervision may need a site-based component.