The short answer: centralized and decentralized clinical trials differ in where study tasks happen. In a centralized trial, people visit a research site. In a decentralized trial, some or all tasks happen at home, at a local clinic, or online.
Neither model is always better. The right choice depends on the product and the outcomes. It also depends on the people in the study, safety needs, and the steps needed for reliable data.
What Is a Centralized Clinical Trial?
A centralized trial is run from one or more research sites. People travel to the site for each step.
Those steps can include:
- Screening
- Consent
- Taking or receiving the product
- Lab tests
- Assessments
- Follow-up visits
This setup gives the study team direct control of procedures and equipment. It often fits when a product is hard to give, needs special imaging, or needs close medical supervision. It also fits tests that can't be done well at home.
The tradeoff is the burden on participants. Travel, time off work, transport, caregiving, and distance can all limit who joins and who stays.
What Is a Decentralized Clinical Trial?
The FDA defines a decentralized trial as one where some or all study tasks happen away from a traditional site. Tasks may happen at home, by telehealth, with a local doctor, or at a local lab.
Going decentralized is not all or nothing. A study might collect daily wearable data and surveys remotely. It might still keep one in-person screening visit or a local lab test.
Common decentralized elements include:
Remote Participation
Recruiting, prescreening, e-consent, and telehealth visits can cut down on travel.
Wearables and Apps
Connected devices, apps, and online surveys can collect planned measures between visits.
Product Delivery
When it's appropriate, the study product can ship straight to participants. The protocol sets the rules for adherence and safety.
Local or At-Home Labs
Samples can be collected at home or at a qualified local site. This works when the protocol and oversight plan support it.
Centralized vs Decentralized Clinical Trials at a Glance
| Study element | Centralized trial | Decentralized trial |
|---|---|---|
| Where participants are | A research site | Home, a local clinic, telehealth, or a mix |
| Study visits | Mostly in person | Remote when it fits, with local or in-person visits when needed |
| Data collection | Site equipment and scheduled tests | Wearables, apps, surveys, connected devices, local labs, and remote tests |
| Geographic reach | Often limited by travel distance | Can recruit across a wider area |
| Participant burden | Travel and fixed appointments may be needed | Fewer site visits can make joining easier |
| Oversight | Site-based investigator and study team | The investigator still oversees, with more coordination across remote tasks |
| Best for | Complex procedures, close supervision, special equipment | Products used at home and outcomes measured in daily life |
| Main operating risk | Site access and slow recruiting | Tech access, missing data, shipping, and remote coordination |
Benefits of Decentralized Clinical Trials
Broader Participant Access
Less travel opens the study to more people. That includes people who live far from a site, have limited mobility, work full time, or care for others. A wider recruiting area can also help the study match the people who actually use the product.
Data From Daily Life
Many health and wellness outcomes happen outside a clinic. Sleep, activity, resting heart rate, heart rate variability, and symptoms can all be measured often. And they're measured in a person's normal routine.
Lower Participant Burden
Remote check-ins, shipped products, and at-home data collection save participants time and travel. A good remote experience can help people stick with the study. That still depends on clear instructions and quick support.
More Frequent Measurement
Site visits give snapshots. Connected devices and short digital check-ins can measure between visits. This helps a study see trends, ups and downs, and change over time.
Remote measurement still needs a plan. That means set endpoints, consistent collection windows, rules for choosing devices, and a plan for missing or irregular data.
Limitations and Risks of Decentralized Trials
Technology and Access
Check device compatibility, tech support, digital skills, phone access, and internet access before recruiting starts.
Data Quality and Missing Data
The protocol should set wear-time rules, adherence thresholds, and when to step in with support. It should also say how missing data will be handled in the analysis.
Operational Coordination
Local labs, remote staff, shipments, telehealth visits, and data vendors all need clear roles. They also need training, oversight, and quality control.
Privacy and Security
Know what each platform collects and where it's stored. Know who can access it and how it moves between systems.
When Is a Centralized Study the Better Choice?
A site-based model may be better when the study needs:
- Complex product preparation or administration
- Special imaging or equipment
- Procedures done by trained clinical staff
- Close observation after an intervention
- Frequent physical exams
- Intensive in-person support for participants
Some studies mix site-based procedures with remote follow-up. The design should follow the study's scientific and safety needs, not a preference for one model.
Decentralized Studies for Supplements and Wellness Products
Supplements, wearable devices, digital health products, and behavior programs are used in everyday life. That makes them a good fit for remote study elements. The outcomes just need to be measurable outside a site.
A decentralized supplement study might include:
- Shipping the study product straight to participants
- Daily adherence tracking
- Validated participant-reported outcomes
- Wearable data
- Optional at-home or local lab tests
A device study might measure sleep, activity, recovery, or other planned endpoints. Participants use the product in their normal routines.
The design still needs a clear research goal and a fair comparison. It also needs defined endpoints, an analysis plan, proper oversight, and an easy participant experience that keeps data coming in.
Regulatory and Oversight Considerations
Remote does not mean unregulated or unsupervised.
The FDA's September 2024 final guidance on clinical trials with decentralized elements covers this. It addresses investigator oversight, remote visits, local health care providers, and digital health tools. It also covers handling the study product, safety monitoring, informed consent, and data management.
The exact rules depend on the study and the product type. They also depend on how the results will be used, the risk to participants, and the regulations that apply.
Plan for regulatory, IRB, privacy, and claims needs during study design. Don't add them after recruiting starts.
How Reputable Health Runs Decentralized Research
Reputable Health designs and runs studies for health and wellness products. It uses remote recruiting, participant engagement, wearable data, validated surveys, biomarkers, and at-home lab options when they fit.
Each study starts by matching the design to the product, the target population, the outcomes, and the evidence goals. The team then runs recruiting, data collection, participant support, analysis, and reporting under 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 always. A decentralized trial can move some or all tasks away from a research site. Some still include an in-person screening, a local lab visit, or a site-based procedure.
Are decentralized clinical trials regulated differently?
Remote elements don't remove any of the study's responsibilities. The rules depend on the product, the study's purpose, the risk, and how the data will be used. Oversight, informed consent, safety monitoring, and data integrity still apply.
What technology is used in decentralized trials?
Common tools include e-consent, telehealth, mobile apps, online surveys, wearables, connected sensors, and remote data platforms. Choose the tools based on the protocol and the people in the study.
Can consumer wearables be used in clinical research?
Yes, when the device, metric, collection schedule, and analysis plan fit the study goal. Researchers should know the device's limits, software changes, and data-access rules. They should also know how consumer metrics differ from endpoints meant for a regulated submission.
Which trial model is best for a wellness product?
It depends on the product and the endpoints. Products used at home, with outcomes measured in daily life, often suit decentralized elements. Studies that need special procedures or close supervision may need a site-based part.