The Science Is Complex. The Language Shouldn’t Be.

Understanding Drives Participation

Clinical trials depend on clear communication. Yet many study materials are written in language that is difficult for the average person to understand. Complex medical terminology, lengthy consent forms, and regulatory language can create barriers that discourage participation, increase confusion, and undermine trust before recruitment even begins.

Health literacy is not simply a patient issue. It is a study design issue.

Sponsors invest heavily in protocol development, site selection, recruitment campaigns, and patient retention strategies. However, the effectiveness of these efforts can be limited if patients struggle to understand the information being presented to them. Clear, patient-centered language helps participants understand what is being asked of them, what they can expect throughout the study, and why their participation matters.

Organizations that prioritize health literacy are not just improving communication. They are improving the participant experience and creating stronger foundations for recruitment and retention success.

What Is Health Literacy and Why Does It Matter?

Health literacy refers to an individual’s ability to find, understand, and use health information to make informed decisions.

In clinical research, health literacy influences a participant’s ability to:

• Understand study objectives
• Evaluate potential risks and benefits
• Follow trial procedures
• Complete study-related activities
• Navigate support resources
• Remain engaged throughout the study journey

When trial materials are difficult to understand, participants may feel overwhelmed or uncertain. This can lead to lower recruitment rates, reduced engagement, protocol deviations, and increased dropout risk.

The challenge is significant because health literacy levels vary widely across patient populations. Educational background, cultural differences, age, disease burden, stress levels, and previous healthcare experiences all influence how information is received and interpreted.

Even highly educated individuals may struggle to process complex medical information while facing a new diagnosis, caring for a loved one, or considering participation in a clinical trial.

Complex Language Creates Hidden Barriers

Clinical trial teams often become so familiar with scientific terminology that they unintentionally write for internal stakeholders rather than potential participants.

Common examples include using terms such as:

• Adverse events
• Concomitant medications
• Randomization
• Inclusion and exclusion criteria
• Investigational product
• Endpoint assessments

While these terms may be commonplace within the research community, they are often confusing for patients and caregivers.

The result is a communication gap between research teams and the people they hope to engage.

This gap can appear in:

Informed Consent Forms

Consent documents are among the most important materials participants receive. Unfortunately, they are often among the most difficult to understand.

Lengthy paragraphs, legal language, and dense scientific content can make participants feel intimidated or confused before enrollment even begins.

Recruitment Materials

Advertisements, websites, social media content, and patient outreach campaigns are intended to attract potential participants. When messages rely too heavily on technical language, they can unintentionally reduce interest and engagement.

Patient Education Materials

Study guides, frequently asked questions, and onboarding materials should help patients feel confident and prepared. Instead, overly complex content can increase uncertainty and create unnecessary stress.

Plain Language Builds Trust

Trust is one of the most valuable assets in clinical research.

Participants want to understand what a trial involves, how it may affect their lives, and whether they feel comfortable moving forward. Clear communication demonstrates respect for participants and supports informed decision-making.

Plain language does not mean oversimplifying science. It means presenting information in ways that are meaningful and understandable to the intended audience.

Effective plain-language communication often includes:

• Shorter sentences
• Everyday vocabulary
• Clear explanations of medical terms
• Logical organization
• Meaningful headings
• Visual aids and supportive graphics
• Real-world examples when appropriate

When participants understand information quickly and confidently, they are more likely to engage with study materials and ask informed questions.

Why Readability Alone Is Not Enough

Many organizations evaluate materials using readability scores. While these tools can be useful, they do not tell the entire story.

A document may achieve a target reading level and still be confusing if it:

• Uses unfamiliar terminology
• Lacks clear organization
• Contains cultural assumptions
• Fails to address participant concerns
• Overwhelms readers with information

True comprehension requires more than simple readability metrics.

Patient-centered communication considers how people actually consume information, what questions they have, and what matters most to them during the decision-making process.

This is one reason why patient engagement is increasingly recognized as an important component of trial planning. Direct input from patients and caregivers can reveal language barriers that internal teams may not recognize.

The Value of Patient and Caregiver Review

One of the most effective ways to improve clinical trial materials is to involve the people they are designed to serve.

Patients and caregivers routinely identify:

• Unclear terminology
• Confusing instructions
• Missing context
• Cultural considerations
• Areas requiring additional explanation

These insights can strengthen recruitment materials, consent forms, educational resources, and ongoing participant communications.

More importantly, they help ensure that materials reflect real-world patient needs rather than internal assumptions.

At PAS, we frequently see that small changes in wording can dramatically improve understanding and engagement. What seems obvious to researchers may not be intuitive to participants encountering the information for the first time.

Better Communication Supports Better Recruitment and Retention

Clinical trial recruitment challenges are often discussed in terms of awareness, site activation timelines, eligibility criteria, or outreach strategies.

However, communication quality deserves equal attention.

Participants who clearly understand study expectations are more likely to:

• Move forward with screening
• Feel confident in their decision
• Remain engaged throughout participation
• Complete study requirements
• Become advocates for research within their communities

Conversely, confusion can create friction throughout the participant journey.

When language is clear, patients spend less time decoding information and more time evaluating whether participation is right for them.

That shift can have a meaningful impact on both recruitment performance and participant retention.

The Future of Clinical Trial Communication Is Patient-Centered

As clinical research becomes more decentralized, digitally enabled, and globally diverse, the need for clear communication will continue to grow.

Patients expect experiences that reflect how they consume information in everyday life. They want clarity, transparency, and respect for their time and attention.

Organizations that embrace health literacy principles are better positioned to build trust, improve participant experiences, and support stronger research outcomes.

The science behind a study may be complex. The language used to explain it should not be.

Create Trial Materials Patients Can Actually Use

Clear communication is one of the most overlooked drivers of recruitment and retention success. Evaluating study materials through a health literacy lens can uncover barriers that may be limiting participant understanding and engagement.

PAS helps sponsors incorporate patient and caregiver perspectives into recruitment materials, informed consent documents, educational resources, and broader engagement strategies to create participant-centered experiences that support study success.