What is medical writing in clinical trials?
Medical writing is the process of creating, editing, and structuring technical and scientific documents required in clinical trials of medical devices. It includes the preparation of materials such as the clinical trial plan, investigator’s brochure, CRF forms, final reports, and lay summaries. The purpose of medical writing is to ensure that documentation complies with MDR, GCP, and ISO 14155 requirements, while remaining understandable for ethics committees, notified bodies, and end users.
Scope of medical writing across the clinical trial lifecycle
The medical writing process covers all stages of a clinical trial — from planning to reporting. The documents created can be divided into:
- Initial documents: clinical trial plan, investigator’s brochure, informed consent forms, SOPs,
- Operational documents: CRFs, visit records, adverse event logs, monitoring notes,
- Final documents: final report, lay summary, clinical evaluation.
Each of these documents is developed in accordance with GCP principles and MDR regulations.
The role of medical writing in effective regulatory communication
Medical writing ensures consistency, clarity, and logical structure of documents submitted to ethics committees and notified bodies. It requires knowledge of clinical and technical language, the ability to process data, and strict adherence to formats required by regulators.
Who is a medical writer?
A medical writer is a specialist responsible for preparing medical, technical, and regulatory documentation that must comply with MDR, GCP, and ISO standards (in particular ISO 14155). Their work combines clinical knowledge, data analysis skills, and proficiency in scientific writing.
Medical writer competencies
Key competencies of a medical writer include:
- knowledge of MDR, GCP, ISO 14155 regulations and clinical documentation structures,
- ability to write clearly and precisely in English (and local languages),
- understanding of clinical trial design, execution, and analysis processes,
- experience in drafting trial protocols, clinical reports, and lay summaries,
- ability to collaborate with clinical teams, statisticians, and regulatory bodies.
Medical writing is not just writing — it is a specialized communication function in a complex regulatory environment that has a direct impact on the success of medical device certification.
Medical writing process step by step
In a well-managed project, medical writing is not a one-time task but a structured process:
- developing the documentation structure
- collecting data from the clinical team
- editing and standardizing content
- verifying compliance with MDR, GCP, and ISO
- iterations and revisions based on feedback
- finalization of documents for submission
Skipping any of these steps often leads to issues during audits.
Preparation of initial documents in medical writing
Already at the stage of trial design, it is necessary to prepare documents such as the clinical trial plan, investigator’s brochure, and informed consent forms. Their quality directly impacts the efficiency of obtaining ethics approvals and starting the trial.
Medical writing during the trial
During the execution of the trial, the medical writer is responsible for updating documentation, drafting CRFs, recording adverse events, and cooperating with the monitoring team. Operational documents must remain consistent with the clinical-trial monitoring process and be subject to audit verification.
Medical writing after trial completion
After the trial is completed, a final report and a lay summary must be prepared — both required within the framework of post-market surveillance. Proper report writing is critical for clinical evaluation and device registration.
Standards and guidelines used in medical writing
Medical writing must comply with:
- MDR – requirements for clinical documentation,
- ISO 14155 – clinical investigation standards for medical devices,
- ICH-GCP – quality standards for conducting and reporting trials,
- ISO 20916 – for IVD performance studies.
Most common mistakes in medical writing
In practice, the biggest issues do not result from missing data, but from how the data is presented and structured. The most common mistakes include:
- inconsistency between the protocol and the final report
- overly general methodology descriptions
- lack of logical connection between clinical data and conclusions
- unclear or overly technical consent forms
- failure to align documentation with specific regulatory requirements
These are the factors that most often lead to delays.
How medical writing impacts time-to-market
In many projects, the bottleneck is not the clinical trial itself — but the documentation.
Well-executed medical writing:
- shortens approval timelines
- reduces the number of iterations
- increases process predictability
- minimizes the risk of document rejection
It is one of the most underestimated factors influencing time-to-market.
How Pure Clinical supports medical writing in clinical trials
The Pure Clinical team provides comprehensive support in medical writing:
- development of clinical trial plans and investigator’s brochures,
- creation and editing of CRFs and ethics documentation,
- preparation of final reports and lay summaries,
- verification of compliance with MDR and ISO requirements,
- support in communication with notified bodies and ethics committees.
Our experience enables the fast delivery of high-quality documentation that meets regulatory expectations and accelerates the process of bringing medical devices to market.
FAQ
Can a medical writer be responsible for documentation in multiple languages within a single trial?
Yes – but it requires close collaboration with professional translators and validation of each version for both content accuracy and regulatory alignment. Documents like informed consent forms must meet local ethical standards, and each version should undergo independent quality control before ethics committee submission.
How does medical writing impact compliance during a notified body audit?
Does using templates in medical writing accelerate document approval?
Using templates aligned with ISO and GCP standards can significantly streamline document drafting and review, especially in multicenter trials. Format standardization shortens approval timelines by quality teams and regulators, reduces revision cycles, and expedites trial initiation.