Which of the following must be included in protocols for GLP studies?

• A. The name of the sponsor
• B. Specifications for acceptable levels of contaminants
• C. The proposed completion date of the study
• D. All of the above

Answer: (D)

In GLP studies, the protocol must be complete and auditable from the start, providing clear framework for responsibility, material quality, and scheduling. Including the sponsor’s identity ensures accountability and traceability—knowing who funds and oversees the study is essential for communications, oversight, and regulatory review. Specifications for acceptable levels of contaminants define how the test article must be characterized and controlled, guaranteeing consistency and safety in the materials used and enabling proper data interpretation. A proposed completion date establishes the study timeline and milestones, which supports planning, progress monitoring, and timely QA and audits. Together, these elements create a protocol that is transparent, controllable, and compliant with GLP requirements. Omitting any of them would weaken accountability, material integrity, or scheduling, undermining study integrity. All of the above elements are required.