Usability Evidence Built Around Real Users and Critical Tasks
Bioexcel supports medical device and IVD manufacturers with human factors strategy, formative usability studies, summative validation, layperson studies, self-testing evaluations and IFU comprehension.
Our approach focuses on whether intended users can perform critical tasks safely, correctly and consistently in the intended use environment.
Does Bioexcel Conduct Human Factors and Usability Studies?
Yes. Bioexcel supports human factors and usability studies for medical devices and IVDs, including formative and summative evaluation, intended-user recruitment, critical-task assessment, use-error analysis, IFU comprehension, layperson studies, data management, statistics and reporting.
Bioexcel Lifesciences & Research LLP supports human factors and usability studies for medical devices and IVDs, including formative and summative evaluation, critical-task assessment, use-error analysis, IFU comprehension, layperson and self-testing studies, data management, statistics and regulatory reporting.
The Question Is Not Only “Can the Device Be Operated?”
Human factors evidence should help determine:
- Can intended users understand the device?
- Can they perform critical tasks?
- Can they recognize warnings?
- Can they recover from errors?
- Can they correctly interpret the output?
- Does the interface create avoidable risk?
- Is the IFU understandable?
- Does the intended environment affect use?
- Are residual use-related risks acceptable?
From User Profile to Usability Validation
Intended User
- Professional
- Patient
- Caregiver
- Layperson
- Technician
Output: User Profiles
Use Environment
- Hospital
- Laboratory
- Clinic
- Ambulance
- Home
- Public setting
Output: Use Context
Task Analysis
- User steps
- Critical tasks
- Potential errors
- Hazardous situations
Output: Task & Risk Map
Formative Evaluation
- User interaction
- Difficulty
- Errors
- Confusion
- Interface issues
Output: Design Insights
Design Refinement
- Device
- Interface
- Labels
- IFU
- Training
Output: Final Candidate Design
Validation Protocol
- Users
- Tasks
- Environment
- Success criteria
- Data collection
Output: Usability Validation Plan
Summative Study
- Evaluate intended users performing critical tasks
Output: Validation Dataset
Use-Error Analysis
- Errors
- Close calls
- Root causes
- Residual risk
Output: HF Conclusions
Regulatory Integration
- Risk Management
- IFU
- Clinical evaluation
- Technical documentation
Output: Usability Evidence Package
What Is a Human Factors Study for a Medical Device?
A human factors study evaluates how intended users interact with a medical device, whether they can complete critical tasks safely and correctly, what use errors occur and whether the device interface, labeling and instructions adequately control use-related risks.
What usability services does Bioexcel provide?
Bioexcel supports formative and summative usability studies, critical-task assessment, use-error analysis, IFU comprehension, layperson and self-testing studies, human factors reporting and Risk Management integration for medical devices and IVDs.
Can Bioexcel support both human factors and clinical performance?
Yes. For products such as self-testing IVDs, Bioexcel can support integrated programs evaluating both clinical performance and intended-user usability.
Can Bioexcel support professional and lay users?
Yes. Study populations can include healthcare professionals, patients, caregivers, technicians and representative lay users according to the intended-use profile.
Usability Engineering Within the Risk-Management Process
Bioexcel's approach is aligned with applicable usability engineering principles and study-specific regulatory requirements.
Recruit the People Who Will Actually Use the Device
Healthcare Professionals
Patients
Caregivers
Lay Users
People without professional clinical training.
User groups should match the intended users stated for the product.
Can Bioexcel Recruit Intended Users for Usability Studies?
Yes. Bioexcel can support feasibility and recruitment of appropriate intended-user groups based on the device, use environment, professional experience, patient profile or layperson criteria.
Usability Depends on Where the Device Is Used
Potential environments:
Environmental Factors
User Characteristics Can Affect Safe Use
Potential characteristics:
- Age
- Education
- Clinical training
- Device experience
- Digital literacy
- Visual ability
- Dexterity
- Language
- Prior training
Recruitment should reflect intended users rather than convenience samples.
Break Device Use Into Observable Steps
Each Step Can Be Assessed For
Focus on Tasks Where an Error Could Cause Harm
A critical task may involve:
- Dose selection
- Device placement
- Sample collection
- Sterility
- Interpretation of result
- Responding to alarm
- Device activation
- Emergency action
What Is a Critical Task in Human Factors?
A critical task is a user action or sequence where incorrect performance or failure to act could cause or contribute to serious harm to the patient or user.
Connect User Interaction to Risk Management
This should connect to the device Risk Management File.
Learn Before Final Validation
Formative studies can evaluate early:
- Interface concepts
- Device prototypes
- Labels
- Packaging
- Instructions
- Workflow
Potential Methods
Can Bioexcel Conduct Formative Usability Studies?
Yes. Bioexcel can support formative usability studies to identify use difficulties, interface problems, labeling issues and potential use errors before the final device design is validated.
Use Findings to Improve the Product
Potential Findings
- User misses warning
- Step order is unclear
- Button labels are confusing
- Device orientation is misunderstood
- IFU image is unclear
- Result interpretation is difficult
Possible Actions
Validate the Final User Interface
Summative validation should evaluate whether representative intended users can perform critical tasks using the final or production-equivalent interface under realistic conditions.
- Representative users
- Representative environment
- Critical tasks
- Realistic workflow
- Final labeling/IFU
- Predefined observation criteria
Can Bioexcel Conduct Summative Usability Validation?
Yes. Bioexcel can support usability validation studies with representative intended users, predefined critical tasks, realistic use environments, use-error assessment and final reporting.
Observe What the User Actually Does
Potential classifications:
- Use error
- Close call
- Difficulty
- Correct task completion
- Moderator assistance where applicable
Each Relevant Error Should Be Investigated For
“User Error” Is Not the End of the Investigation
Potential root causes:
- Interface ambiguity
- Poor feedback
- Similar controls
- Inadequate warning
- Confusing IFU
- Unexpected workflow
- User expectation
- Training gap
Core message: Do not blame the user before evaluating the interface.
Can Users Understand the Instructions Without Unintended Support?
Bioexcel can assess:
- Device preparation
- Contraindications
- Warnings
- Sample collection
- Procedure
- Timing
- Result interpretation
- Troubleshooting
- Disposal
Potential Measures
Can Bioexcel Conduct IFU Comprehension Studies?
Yes. Bioexcel can assess whether intended users can locate, understand and correctly apply important instructions, warnings, procedural steps and result-interpretation information in the device IFU.
Evaluate More Than the Instruction Manual
Potential materials:
- Device label
- Outer package
- Symbols
- Warnings
- Quick-reference guide
- Mobile/app instructions
- On-screen instructions
Evidence for Users Without Professional Training
Layperson studies may assess:
- Product selection
- IFU comprehension
- Sample collection
- Device preparation
- Device operation
- Timing
- Result interpretation
- Troubleshooting
- Disposal
Relevant For
Can Bioexcel Conduct Layperson Studies?
Yes. Bioexcel can support layperson studies involving representative non-professional intended users, including participant recruitment, device-use observation, IFU comprehension, result interpretation, data management, statistics and reporting.
Evaluate the Complete User Journey
Potential Endpoints
Capillary Blood Collection Adds Specific Usability Questions
Assess:
- Lancet use
- Blood collection
- Sample volume
- Transfer to device
- Hygiene
- User confidence
- Failed collections
- Repeat attempts
Swab-Based Self-Tests
- Correct anatomical sampling
- Swab handling
- Extraction
- Timing
- Device application
- Result interpretation
Sampling error can influence both usability and clinical performance.
Correct Testing Is Not Enough if the Result Is Misread
Assess:
- Positive
- Negative
- Weak positive
- Invalid
- Faint line
- Digital output
- Alert/warning interpretation
Potential Metric
Correct Interpretation Rate
Challenge the User With Realistic Difficult Cases
For visual rapid tests, usability may include:
- Strong positive
- Weak positive
- Negative
- Invalid
This can identify interpretation challenges not visible with only obvious results.
Usability for Clinicians and Trained Operators
- Device preparation
- Workflow
- Setup
- Operation
- Alarms
- Result interpretation
- Troubleshooting
Procedure-Based Devices Require Workflow Evaluation
- Preparation
- Assembly
- Deployment
- Orientation
- Instrument interaction
- Troubleshooting
- Device retrieval
- Emergency steps
Human Factors for Complex User Interfaces
- System setup
- Console controls
- Instrument selection
- Alerts
- Camera/navigation
- Emergency stop
- Team communication
- System recovery
Consider
The User Interface Is Part of the Clinical Risk
- Login
- Patient selection
- Data entry
- Result interpretation
- Alert response
- Override
- Error recovery
Does the User Understand the Algorithm Output?
- Is AI confidence understandable?
- Does user over-trust the recommendation?
- Can user recognize uncertainty?
- Can user override output?
- Is alert fatigue a risk?
Evaluate Devices Outside the Controlled Clinical Environment
Potential home-use issues:
- Lighting
- Distractions
- Storage
- Connectivity
- Hygiene
- User memory
- Repeat use
- Family involvement
Can Bioexcel Support Home-Use Medical Device Studies?
Yes. Bioexcel can support appropriate home-use study designs to evaluate device usability, adherence, user interaction and relevant clinical or performance outcomes in the intended use environment.
Select the Model According to the Risk Question
Simulated Use
Controlled but realistic environment.
Useful Where
- Actual harm cannot be ethically induced
- Rare scenarios must be tested
- Emergency conditions need simulation
Actual Use
Device used in real clinical/home settings.
Useful Where
- Potentially useful where real workflow itself is important
Validation Should Reflect the Intended Training Model
If intended users receive:
- No training
- IFU only
- Short training
- Formal training
The study should reproduce the expected commercial-use condition as closely as appropriate. Do not over-train participants if the marketed user will not receive equivalent training.
Avoid Accidentally Helping the Participant
Study moderators should follow standardized instructions. They should avoid:
- Coaching
- Correcting
- Hinting
- Directing the user
unless required for participant safety.
Understand Both Behavior and Reason
Observation
What happened?
Post-Task Interview
Why did it happen?
Root-Cause Analysis
Was it caused by: Interface, IFU, Training, Environment, User expectation?
Usability Sample Size Depends on Study Purpose
Planning should consider:
- Formative vs summative
- Number of user groups
- Device complexity
- Critical tasks
- Risk
- Regulatory objective
For layperson clinical performance studies, sample size may also depend on statistical performance objectives.
Multiple Intended Users May Require Separate Evaluation
User Group A
Experienced clinicians
User Group B
New clinicians
User Group C
Nurses/technicians
The study design should reflect meaningful differences in intended-user characteristics.
Capture Every Critical Task and Observation
Potential eCRF fields:
- User ID
- User profile
- Task
- Task success
- Use error
- Close call
- Difficulty
- Assistance
- Root cause
- Interview response
Quantify User Performance Where Appropriate
Potential outputs:
- Task success rate
- Use-error rate
- IFU comprehension rate
- Correct interpretation rate
- Invalid-test rate
- User-group comparison
- Confidence intervals
Qualitative root-cause analysis remains important alongside percentages.
Document the Usability Evidence
Potential structure:
- Device
- Intended users
- Environment
- Study objective
- User groups
- Critical tasks
- Methodology
- Results
- Use errors
- Close calls
- Root-cause analysis
- Residual use-related risk
- Conclusions
Usability Findings Should Feed Back Into Risk Management
Can Bioexcel Integrate Human Factors Findings With Risk Management?
Yes. Bioexcel can support traceability between use-related hazards, critical tasks, observed use errors, risk controls and residual-risk conclusions for integration into the broader Risk Management process.
Usability Can Affect Clinical Safety and Performance
Relevant findings may support discussion of:
- Intended user
- Safe use
- User-related adverse outcomes
- Benefit-risk
- Residual risk
- Clinical claims
Combine Performance and Usability Where Appropriate
Clinical Performance
Is the test result correct?
Usability
Can the lay user perform the test correctly?
Interpretation
Can they understand the result?
This can be especially relevant for self-testing IVDs.
Studies With European Intended Users
Bioexcel can support European feasibility for:
- Layperson recruitment
- Self-testing
- IFU comprehension
- Clinical performance
- Home-use evaluation
using suitable European sites and local resources.
Can Bioexcel Conduct Layperson IVD Studies in Europe?
Yes. Bioexcel can support European layperson and self-testing studies through suitable local clinical resources combined with centralized study design, data management, statistics and reporting.
Human Factors & Intended-User Evaluation in India
Potential study populations:
- Healthcare professionals
- Laboratory users
- Patients
- Caregivers
- Lay users
Can Bioexcel Conduct Medical Device Usability Studies in India?
Yes. Bioexcel can support suitable professional-user, patient, caregiver and layperson usability studies in India, subject to the device and intended-use requirements.
Need Early Design Feedback?
Bioexcel can support:
- Prototype evaluation
- Task analysis
- IFU review
- User interviews
- Formative testing
without conducting the final validation study.
Already Completed Formative Work?
Bioexcel can review:
- User profiles
- Risk analysis
- Critical tasks
- Formative findings
- Final design
- IFU
and develop the final validation study.
Already Have a Usability File?
Bioexcel can review for gaps involving:
- Intended users
- Environment
- Use scenarios
- Critical tasks
- Use-related risks
- Formative evidence
- Validation evidence
- IFU
- Risk traceability
Why MedTech Sponsors Use Bioexcel for Human Factors & Usability
Medical Device & IVD Focus
Study designs reflect actual device-use risks.
Professional + Lay Users
Support across clinicians, technicians, patients and laypeople.
Clinical + Human Factors Integration
Usability evidence can connect with clinical performance.
Risk Management Linkage
Use errors are evaluated in the context of potential harm.
Data + Statistics
Quantitative and qualitative study outputs can be integrated.
India + Europe
Flexible intended-user recruitment models.
Human Factors & Usability Deliverables
Depending on scope:
- Human factors strategy
- User profile
- Use-environment analysis
- Task analysis
- Critical-task identification
- Use-related risk assessment support
- Formative study protocol
- Formative study report
- IFU comprehension protocol
- Layperson study protocol
- Summative/usability validation protocol
- Participant recruitment plan
- eCRF
- Data Management Plan
- Statistical Analysis Plan
- Usability Validation Report
- Use-error analysis
- Risk Management inputs
- Regulatory response support
Human Factors in Practice
Self-Testing IVD
Users: Laypersons — Tasks: Sample collection, testing, result interpretation
Outputs: Task success + interpretation + use-error analysis
Surgical Device
Users: Surgeons — Focus: Device preparation, deployment and troubleshooting
Output: Critical-task validation
Digital Health Tool
Users: Clinicians
Focus: Alert comprehension and workflow integration
Frequently Asked Questions About Human Factors & Usability
Yes. Bioexcel supports formative and summative usability studies for medical devices and IVDs.
Bioexcel evaluates whether real intended users can use medical devices safely and correctly under realistic conditions—and connects those findings to the product's clinical and risk evidence.