Which statement best describes Quality Assurance in clinical trials?

• A. QA is about data accuracy in case report forms
• B. QC replaces QA
• C. QA concerns personal performance rather than processes
• D. QA encompasses systematic actions to ensure processes and systems prevent errors and comply with GCP

Answer: (D)

Quality Assurance in clinical trials is a proactive, system-wide approach that uses formal, organized actions to prevent errors and ensure that the trial's processes and systems comply with GCP and the protocol. It covers how the study is run—policies, standard operating procedures, training, documentation, vendor management, audits, and change control—so quality is built into the study from the start rather than being checked only after results are produced. It’s broader than data accuracy in case report forms (that’s a data quality task often handled by QC or data management), it doesn’t replace QC, and it isn’t focused on evaluating personal performance alone but on the quality system and processes. That makes the statement about systematic actions ensuring process and system compliance with GCP the best description.