A predicate device is a legally marketed U.S. device with the same intended use and technological characteristics that do not raise different questions of safety and effectiveness compared with your device. Find candidates in FDA’s Product Classification Database (by product code), FDA’s 510(k) database (by device name/manufacturer), and AccessGUDID (public UDI)—which often lists premarket submission numbers you can pivot on. Pick well and you streamline review; pick poorly and you risk NSE and costly rework.

This guide provides the step-by-step process for finding strong predicate devices that support successful 510(k) submissions.

What Is a Predicate Device?

A predicate device is a legally marketed U.S. device used as your comparison benchmark to demonstrate substantial equivalence in a 510(k). Predicates can be 510(k)-cleared, preamendments devices, reclassified devices, or De Novo–granted devices; they cannot be in violation of the FD&C Act.

Your predicate device must meet two critical requirements:

Same intended use as your device
Similar technological characteristics or differences that don't raise new safety/effectiveness questions

You must identify the predicate(s) you rely on. If you use more than one predicate, FDA recommends designating a primary predicate that is most similar in indications for use and technology to streamline review.

Types of Valid Predicate Devices

Recently Cleared 510(k) Devices (Recommended)

Most common choice for predicates
Recent clearances show current FDA expectations
Clear regulatory pathway and documentation available

Pre-Amendment Devices (Before May 28, 1976)

Grandfathered devices from before FDA oversight
May require additional documentation to prove preamendment status
Since medical science has advanced greatly since 1976, it is recommended that you use a recently cleared device under 510(k) as your predicate device

Downclassified Devices

Originally Class III devices reclassified to Class II or I
Less common but valid predicate options

De Novo Granted Devices

Devices cleared through the De Novo pathway
Valid predicates for similar novel devices

Why Predicate Selection Is Critical

A weak predicate invites RTA holds or NSE, which means more testing, possible pathway shifts, and time.

The High Cost of Wrong Predicates

Regulatory Rejection

FDA refuses to file (RTA) or issues Not Substantially Equivalent (NSE) determination
Forces costly resubmission or pathway change to De Novo/PMA

Timeline Delays

Wrong predicate adds 6-18 months to approval timeline
Late-stage predicate changes require extensive documentation updates

Development Cost Escalation

Additional testing to address differences from weak predicate
Potential clinical data requirements for technological differences

Strategic Advantages of Strong Predicates

Streamlined Approval Process

Clear substantial equivalence pathway
Reduced additional testing requirements
Faster review and clearance timelines

Reduced Development Costs

Lower testing burden when predicate closely matches your device
Clear precedent for FDA expectations and requirements

Competitive Market Intelligence

Understanding competitor positioning and claims
Insights into successful regulatory strategies in your space

Step-by-Step Predicate Search Process

Use Complizen - it’s the fast, accurate, and modern way to find your predicate.

In seconds, Complizen scans FDA databases, surfaces comparable devices, and highlights the most defensible predicates for your 510(k).

Prefer the traditional route? Here’s how it’s usually done:

Step 1: Determine Your Device Classification

Before searching for predicates, identify your device's FDA classification and product code.

Use the Product Classification Database

Go to FDA's Product Classification Database
Search by device name, regulation number, or browse by panel
Identify your 3-letter product code
Note your device class (I, II, or III) and applicable regulations

Why This Matters The classification of the device and product code is essential in searching for predicate devices. Your product code groups similar devices and provides the most targeted search results.

Step 2: Search the FDA 510(k) Database

Primary Search Methods

Product Code Search (Most Effective)

Enter your 3-letter product code in the 510(k) database
510(k)s for similar device types are usually linked in the 510(k) database by the same product code
Review all devices in your product code category

Device Name Search

Use one descriptive keyword (not full device name)
It is usually best to complete only one box in the online search form per search. The search engine searches for an exact match of text
Try variations: "ultrasound," "ultrasonic," "transducer"

Manufacturer Search

Search by known competitor names
Hyphens or spaces in names can make a difference, so try different combinations of the manufacturer's name

Step 3: Use Alternative Search Resources

Global Unique Device Identification Database (GUDID) GUDID offers expanded search capabilities beyond the 510(k) database:

Search devices currently in commercial distribution
Filter by over-the-counter vs. prescription status
GUDID is comprised of raw data entered by manufacturers without any FDA review, so verify findings in 510(k) database

Advanced Search Techniques

Search by therapeutic panel (orthopedic, cardiovascular, etc.)
Review similar devices from different product codes
Use FDA's recall database to identify devices to avoid as predicates

Step 4: Evaluate Potential Predicates

Critical Evaluation Criteria

Intended Use Alignment

Compare indications for use statements word-by-word
Ensure target patient populations match
Verify clinical applications are identical

Technological Characteristics Review these key areas for similarity:

Design and materials
Energy source and delivery method
Performance specifications
Software and algorithms (if applicable)
Sterilization and packaging

Regulatory History

Recent clearance date (within 5 years preferred)
No outstanding recalls or warning letters
Clear substantial equivalence determination
Adequate supporting documentation available

Step 5: Access and Analyze Predicate Documentation

510(k) Summary Documents

Download the PDF summary from the 510(k) database
Review indications for use, device description, and substantial equivalence comparison
Note testing methods and performance data provided

Predicate Research Checklist

□ Device has same intended use as your device

□ Technological differences don't raise new safety questions

□ Recent clearance with clear documentation

□ No regulatory issues or recalls

□ Sufficient technical detail for comparison

□ Appropriate testing standards and methods used

p/s Complizen takes away the guesswork, more here.

Advanced Predicate Selection Strategies

Using Multiple Predicates

When to Consider Multiple Predicates

Your device combines features from different existing devices
No single predicate covers all technological characteristics
Strengthen substantial equivalence argument through multiple comparisons

Split Predicate Limitations The use of split predicates is inconsistent with the 510(k) regulatory standard. You still need one primary predicate with the closest overall match.

Reference Devices vs. Predicates

Reference Devices

Support scientific methodology or standard reference values
Provide additional context but don't establish substantial equivalence
Manufacturers may identify "reference devices" within their 510(k) to support scientific methodology

Primary Predicate Requirements

Must be most similar device for indications and technology
Forms the foundation of your substantial equivalence argument

Predicate Age Considerations

Recent Predicates (Recommended)

Reflect current FDA review standards
Incorporate latest safety and performance requirements
Clear precedent for approval pathway

Older Predicates (Use Cautiously)

May require additional justification for current standards
Technology gaps may need bridging with additional data
Regulation doesn't say how old the predicate should be. It's up to us to decide

Common Predicate Selection Mistakes

Mistake 1: Choosing Convenient Over Appropriate Predicates

The Problem Companies select predicates based on available information rather than true similarity.

The Solution Prioritize intended use and technological alignment over documentation convenience. A harder-to-research but more appropriate predicate saves money long-term.

Mistake 2: Treating “Identical” As The Standard

The Problem FDA doesn’t require clones.

The Solution Differences are allowed if they don’t raise different questions of safety/effectiveness, and you support them with data. Use the 513(i) test explicitly in your comparison.

Mistake 3: Using Problematic Predicates

Red Flags to Avoid

Devices with recalls or safety issues
Predicates with unclear regulatory status
Devices no longer manufactured (though legally permissible)

Mistake 4: Inadequate Predicate Research

The Problem Superficial predicate analysis leads to substantial equivalence failures.

The Solution You should explain why you will not consider it for your file. This will also show to the Agent that you really made a deep dive. Document your entire predicate evaluation process.

Predicate Documentation and Comparison

Building Your Substantial Equivalence Argument

Side-by-Side Comparison Tables Create detailed comparisons covering:

Indications for use
Device design and components
Materials and biocompatibility
Performance specifications
Testing standards and methods
Labeling and instructions for use

Addressing Technological Differences For any differences from your predicate:

Explain why differences don't raise new safety questions
Provide supporting test data demonstrating equivalence
Reference applicable standards and guidance documents

Documentation Best Practices

Organize Your Predicate File

510(k) summary and clearance letter
Device labeling and instructions for use
Relevant testing data and standards
Manufacturing information (if available)
Any FDA correspondence or guidance related to predicate

Track Multiple Predicate Candidates Maintain comparison spreadsheets for all potential predicates to document your selection rationale and demonstrate thorough evaluation to FDA.

Emerging Technology Solutions Next-generation regulatory platforms are beginning to integrate predicate device research with comprehensive regulatory strategy planning, automating much of the manual database searching and comparison work.

510(k) Database Search Optimization

Search Strategy Tips

FDA databases on the web are updated on or around the 5th of every month
Use exact text matches - the search engine is literal
Start broad with single keywords, then narrow results
Try different manufacturer name variations and spacing

Database Limitations to Know

510(k) database contains original application information only
Names may not reflect current owners or distributors
Some PDFs are scanned documents with OCR text extraction issues
Not all predicate information may be publicly available

Alternative Research Methods

Industry Intelligence

Conference presentations and poster sessions
Peer-reviewed publications citing specific devices
Patent searches for competing technologies
Trade publication device reviews and comparisons

Professional Networks

Regulatory consultants with device expertise
Industry association member directories
Medical device conference attendee networks

Predicate Selection Timeline and Planning

Early Development Integration

Predicate Research During Design Phase Start predicate identification during device conceptualization, not after development completion. This is much harder to adjust a finished product to meet regulatory requirements than to design it according to those requirements from the start.

Development Decision Points

Predicate selection should inform design decisions
Technology choices should consider predicate alignment
Testing protocols should match predicate standards

Resource Planning

Internal Team Requirements

Regulatory affairs expertise for FDA database navigation
Engineering input for technological characteristic comparison
Clinical input for intended use evaluation

External Support Considerations

Regulatory consultants for complex predicate evaluations
Patent attorneys for freedom-to-operate analysis
Clinical advisors for intended use refinement

When No Suitable Predicate Exists

De Novo Pathway Considerations

If your device has no appropriate predicate, you cannot use a 510(k). By default, a new (post-amendments) device is Class III under FD&C §513(f)(1)—but you can request De Novo classification under §513(f)(2) to place it in Class I or II when general and/or special controls provide a reasonable assurance of safety and effectiveness.

De Novo Request Criteria

Novel device with no appropriate predicate
Low to moderate risk device
General and special controls provide reasonable assurance of safety and effectiveness

Strategic Decision Framework

Cost comparison: De Novo vs. PMA pathway
Timeline implications: 150 days for De Novo review
Market advantage of establishing new device category

Creating Your Own Predicate

De Novo Success Creates Predicates If your De Novo request is successful, the new device's safety and efficacy can be established using the FDA's general and special controls alone. Your cleared device then becomes a predicate for future similar devices.

Competitive Positioning

First-to-market advantage in new device category
Control narrative for substantial equivalence standards
Establish testing and performance benchmarks

International Predicate Considerations

Global Regulatory Harmonization

CE Mark Device Databases

EUDAMED for EU market intelligence
Medical Device Coordination Group (MDCG) guidance documents

Regional Regulatory Intelligence

Health Canada Medical Device License Database
TGA Australian Register of Therapeutic Goods
PMDA Japan medical device approval information

Cross-Regional Strategy Use international device approvals to:

Validate technological approaches
Identify global competitors and solutions
Support US predicate selection rationale

The Fastest Path to Market

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Frequently Asked Questions

Can I use a device that's no longer manufactured as a predicate?

Yes, an applicant may claim SE to a device that is no longer being marketed in the U.S. However, devices still in commercial distribution make stronger predicates for FDA review.

How old can my predicate device be?

There's no regulatory limit, but recent predicates (within 5 years) are preferred. Because medical technology has changed greatly since 1976, almost all 510(k) submissions claim substantial equivalence to a postamendment device.

Can I change my predicate after submitting my 510(k)?

Major predicate changes typically require withdrawal and resubmission. Minor clarifications may be addressed through FDA questions during review.

What if my predicate device has a recall?

Avoid predicates with serious recalls or ongoing safety issues. Minor recalls that have been resolved may still be acceptable with proper justification.

How many predicates should I identify?

Identify one primary predicate that most closely matches your device. Multiple predicates can support your argument but should supplement, not replace, a strong primary predicate.

What if the FDA disagrees with my predicate selection?

FDA may request additional information or suggest alternative predicates during review. Strong initial predicate research with documented rationale helps avoid this scenario.

Can I use a predicate from a different product code?

Generally not recommended. Product codes group similar devices, and cross-code predicates raise substantial equivalence questions. Exceptional cases require extensive justification.

Should I avoid predicates from competitors?

No - competitors often have the most relevant predicates. Focus on technological similarity rather than business relationships. The best predicate is the most similar device, regardless of manufacturer.

What documentation do I need from my predicate device?

At minimum: 510(k) clearance letter, device labeling, indications for use, and substantial equivalence summary. Additional technical documentation strengthens your comparison.

How do I handle proprietary information in predicate devices?

Use publicly available information from FDA databases and device labeling. Don't attempt to obtain proprietary design details - focus on performance characteristics and intended use alignment.

How to Find a Predicate Device: Complete FDA Medical Device Guide