Laboratory Animal Pain Assessment and Welfare

Recognising and treating pain in laboratory animals is both an ethical requirement and a scientific necessity. Unmanaged pain confounds experimental results and causes avoidable suffering.

Key Facts

The Rodent Grimace Scale provides validated facial expression-based pain assessment for mice
Pain in laboratory animals is legally required to be minimised under the Animals (Scientific Procedures) Act
Analgesic treatment of experimental animals improves study quality by reducing stress confounds
Post-operative pain is frequently undertreated in laboratory animals despite availability of analgesics
The 3Rs principle of Refinement explicitly requires pain management to minimise suffering

Welfare Considerations

Laboratory animal pain management has improved significantly with the development of validated species-specific pain assessment tools. The Mouse Grimace Scale allows rapid, reliable pain scoring from facial expressions. However, despite legal requirements, pain is still frequently undertreated in laboratory settings due to lack of training, concern about confounding experimental results, and resource constraints. Unmanaged pain causes suffering, distress, and physiological stress responses that themselves confound experimental data - making pain management both a welfare imperative and a scientific necessity.

What You Can Do

Support NC3Rs and FRAME which promote pain management training in laboratory animal science
Advocate for mandatory pain assessment training for all personnel working with laboratory animals
Support research into species-specific analgesics and dosing regimens for laboratory animals
Engage with university animal welfare bodies about pain management standards
Back improved severity reporting requirements that capture actual pain experience