Which of the following describes welfare monitoring in a protocol?

• A. Welfare monitoring occurs only at the end of the study.
• B. Welfare monitoring is optional and rarely used.
• C. Welfare monitoring includes regular observations and predefined humane endpoints.
• D. Welfare monitoring is handled only by external inspectors.

Answer: (C)

Ongoing welfare monitoring means watching animals regularly throughout a study and using predefined humane endpoints to guide actions when welfare concerns arise. Regular observations ensure that pain, distress, or adverse effects from procedures or treatments are detected early, so steps like adjusting analgesia, providing supportive care, or, if necessary, humane euthanasia can be performed promptly. Predefined humane endpoints give objective, approved criteria for when an animal should be removed from the study or euthanized, preventing unnecessary suffering and ensuring consistency across the protocol. This approach is carried out by trained personnel as part of daily care and oversight, not left only to end-of-study checks or external inspectors.