Category: Participant Rights, Privacy and Consent

In most cases, you can only participate in one clinical trial at a time. This is because:

• Taking part in multiple trials could affect your safety.
• Overlapping treatments or procedures may interfere with research results.
• Ethical guidelines prevent duplicate enrollment without careful coordination.

However, you can:

• Join another trial after completing one, as long as there’s no required waiting period.
• Participate in non-interventional studies (like surveys or registries) while enrolled in a treatment trial, depending on study rules.

What if you are contacted by multiple sites?

You are always free to speak to different research teams, ask questions, and choose the trial that’s right for you.

Key Note: If you’ve already joined a trial through another platform or site, inform the research team or DecenTrialz so we can update your profile and avoid duplicate referrals.

Not qualifying for a clinical trial can feel disappointing, but it is more common than you might think. There are many reasons why someone might not be eligible, and they usually have nothing to do with your health or worthiness as a participant.

Common reasons you might not qualify

• You don’t meet specific inclusion criteria (such as age range, test results)
• You have a medical history that could interfere with the study
• You are taking a medication that could interact with the study drug
• The trial has already met its recruitment target

What happens next?

• Your data stays securely stored in your DecenTrialz profile.
• You can be considered for other trials in the future.
• You can update your information at any time to improve your chances of matching with other studies.

Key Note: Being ineligible for one trial does not prevent you from participating in others. Many users match with future studies over time.

Once you complete the pre-screening process on DecenTrialz, your information is securely reviewed to identify clinical trials that may be a match for your profile. If a potential match is found, here’s what typically happens next:

1. Referral to a Research Site
   You will be referred to the official clinical research site managing that specific trial. This may be a hospital, academic center, or research facility.
2. Formal Screening Appointment
   The research team will contact you to set up a screening visit. This may include:
   • A detailed medical questionnaire
   • Review of your health records
   • Physical exams or lab tests
   • Explanation of the study’s purpose and procedures
3. Informed Consent Process
   Before anything else happens, the research team will walk you through an informed consent form. You will have time to read it, ask questions, and decide whether or not you want to participate.
4. Final Eligibility Review
   After tests or evaluations, the research team will determine if you meet all criteria and are safe to enroll in the trial.

Key Note: DecenTrialz does not conduct medical testing or enroll participants. We only support the referral process up to the point of contact with the research site.

Pre-screening is the first step in the clinical trial process. It happens before you are officially enrolled or give informed consent.

At DecenTrialz, we use a simple, secure online form that asks you:

• Whether you are a healthy volunteer or have a specific medical condition
• Your age, gender, and location
• A few basic questions about your medical history and current health

This information is used only to match you with relevant studies. If your answers suggest a possible match, we will refer you to the appropriate research site, where formal eligibility assessment and the consent process begin.

What pre-screening is not

• It is not a guarantee you will be accepted into a trial.
• It does not involve any medical procedures or tests.
• It does not require you to commit to anything.

Why pre-screening is helpful

• It saves time by filtering out trials that don’t apply to you.
• It protects your privacy by avoiding unnecessary data sharing.
• It ensures you are only referred to trials you may actually qualify for.

Key Note: DecenTrialz only supports pre-screening and referral. The official screening, enrollment, and consent are conducted by the research site managing the study.

Every clinical trial has two sets of rules:

• Inclusion criteria: the traits or conditions you must have to participate.
• Exclusion criteria: the traits or conditions that prevent you from participating, usually for safety or scientific reasons.

Eligibility may be based on

• Age and gender
• Diagnosis and disease stage
• Current medications or treatments
• Medical history (such as past surgeries or conditions)
• Test results (like blood tests or imaging)
• Lifestyle factors (such as smoking, alcohol use, or pregnancy)

Before you are enrolled, researchers will compare your information to the study’s criteria. If you do not qualify, it does not mean something is wrong, it simply means the trial is not the right fit.

Why these rules matter

• They help keep participants safe.
• They ensure the results of the trial are accurate and useful.
• They protect against unnecessary risks or treatments that may not be suitable.

Key Note: DecenTrialz uses a secure pre-screening system to help assess your eligibility before referring you to a research site.

Clinical trials are designed to answer specific medical questions, and to do that safely and accurately, each trial has clear rules about who can and cannot participate. These rules are called eligibility criteria, and they are based on scientific and ethical considerations to protect participants and ensure the reliability of the study.

Types of people who may be eligible to join a trial

• Adults over 18 years of age, with or without medical conditions
• Children or adolescents (under 18) with parental or guardian involvement
• Healthy volunteers who want to contribute to medical research
• Individuals with specific conditions who are seeking new treatments
• People from specific demographic groups (e.g., age, gender, ethnicity)

Key Note: Eligibility does not mean you are required to join. Participation is always voluntary and based on informed consent.