What are the best practices for developing a study protocol?
A clinical trial protocol is the backbone of the entire project — defining objectives, structure, methodology, data analysis and evaluation of outcomes. Its quality directly influences study execution, patient safety and the scientific value of results. To avoid delays and revisions, it's important to follow best practices from the beginning.
The primary objective must be precise, measurable and clinically meaningful. Secondary objectives should be limited to avoid diluting the study’s focus. Endpoints must be objective, quantifiable and assessable consistently across sites.
Inclusion and exclusion criteria must be well-balanced. Overly strict criteria can slow recruitment, extend study duration and increase costs. Biostat® ensures that eligibility criteria match the available patient population and real-world site capabilities.
A logical and feasible Schedule of Assessments is crucial. It should avoid unnecessary repetitions and patient burden. We ensure procedures are grouped efficiently, minimise on-site visits and incorporate remote assessments (ePRO, online visits, remote monitoring) when possible — improving both patient comfort and data quality.
Statistical assumptions are equally important. Sample size, power calculations, interim/final analysis plans and selection of statistical methods form the foundation of credible results. Biostat®’s biostatisticians handle these elements in close cooperation with the study team.
We also develop a Critical Data/Process Identification strategy to focus monitoring resources on the most important elements of the study.
To improve patient retention, we include practical solutions such as visit reminders, reimbursement for travel, ePRO diaries or home visits. These elements increase engagement and reduce drop-outs.
Finally, protocol consistency and version control are essential. A well-structured, coherent document with proper version management shortens the approval process and reduces revisions.
A well-designed protocol is not just a regulatory requirement — it is a practical tool for managing the entire study. At Biostat®, we ensure every part of the protocol is practical, compliant and suited to the real-world capabilities of study teams.
