Which element describes the route of administration, dosage, dosage regimen, and treatment periods?

• A. The trial's recruitment plan
• B. The patient compensation terms
• C. The adverse event reporting form
• D. Description of the route of administration, dosage, dosage regimen, and treatment periods

Answer: (D)

Understanding how the trial interventions are described is essential. In GCP, the protocol must spell out exactly how the investigational product is administered, including the route of administration, the dosage, the dosing schedule (dosage regimen), and the duration or treatment periods. This level of detail ensures that all sites deliver the treatment consistently, enables safe dose adjustments when needed, and supports reproducibility and safety monitoring across the study.

The other elements serve different purposes: a recruitment plan outlines how participants are enrolled; compensation terms describe payments to participants; and the adverse event reporting form is used to document safety events. None of these describe how the treatment itself is given, which is why the described element is the correct focus.