What is the purpose of standard operating procedures (SOPs) in a mouse facility?

• A. To optimize cost efficiency.
• B. To standardize welfare-critical processes, ensure consistency, safety, and regulatory compliance.
• C. To speed up breeding.
• D. To document staff performance.

Answer: (B)

The main idea is that SOPs standardize welfare-critical tasks to ensure every animal receives consistent care, while keeping people safe and meeting regulatory requirements. In a mouse facility, these procedures spell out exactly how housing, handling, cleaning, feeding, and routine tasks are performed, as well as how procedures like injections, blood collection, anesthesia, analgesia, euthanasia, and experimental protocols are carried out. By detailing each step, the required equipment, timing, and documentation, SOPs minimize variation between staff and over time, which protects animal welfare and improves the reliability and reproducibility of research results. They also serve as essential training tools, giving new staff a clear path to perform tasks correctly and to recognize when something deviates from the approved method. On top of that, SOPs support safety and regulatory compliance, providing auditable records of approved procedures and demonstrating adherence to institutional, national, and GLP standards. While cost control, breeding speed, and staff performance are not the primary aim, they can be affected indirectly because well-implemented SOPs reduce errors, injuries, and protocol deviations, contributing to overall efficiency and ethical animal care.