Clinical trial design essentials for genetic counselors

Genetic counseling often raises important questions: Does a new service delivery model improve patient outcomes? Will delivering results in a certain way reduce anxiety? Does a genetic counseling intervention in certain populations change health outcomes? While observational studies and clinical experience can suggest answers, they cannot fully rule out chance, bias, or confounding. Clinical trials, especially randomized controlled trials, are designed to minimize these influences and establish cause-and-effect. This level of rigor matters when patients, providers, policymakers, and insurers make decisions based on study findings. By leading or contributing to trials, genetic counselors can strengthen the profession's evidence base, shape policy, and determine the efficacy of different approaches to genetic counseling care. If the answer to a question could change practice or policy and is not yet backed by high-quality evidence, a clinical trial may be the most reliable and impactful way to find it. This paper serves as an introduction and guide to designing and conducting clinical trials in genetic counseling.