Regulation of Laboratory Animal Care in the U.S.

The use of animals in research and testing is a complex field governed by a robust framework of laws, regulations, and ethical guidelines. These regulations aim to ensure the humane care and use of laboratory animals while advancing scientific knowledge. This article provides an overview of the key regulatory requirements in the United States as of February 2026.

Historical Context and Legal Foundations

The practice of using non-human animals in scientific investigation dates back centuries. However, modern regulations began to seize shape in the mid-20th century, driven by growing public concern for animal welfare. The foundation of these regulations lies in several key pieces of legislation.

Key Legislation and Regulations

• Animal Welfare Act (AWA) of 1966: This is the primary federal law governing the humane care and treatment of certain warm-blooded animals used in research, exhibition, transport, and dealing. The AWA is administered by the Animal and Plant Health Inspection Service (APHIS) of the USDA .
• Animal Welfare Act Regulations (AWAR): Detailed instructions on how to comply with the AWA are found in Title 9 of the Code of Federal Regulations (CFR) .
• Health Research Extension Act of 1985: This act provides the legislative mandate for the Public Health Service (PHS) Policy on Humane Care and Use of Laboratory Animals .
• Public Health Service Policy on Humane Care and Use of Laboratory Animals (PHS Policy): This policy applies to research funded by the National Institutes of Health (NIH) and other PHS agencies.
• U.S. Government Principles for the Utilization and Care of Vertebrate Animals Used in Testing, Research, and Training: These principles guide federal agencies in the responsible use of animals in research.

Scope of Regulations

The AWA covers warm-blooded animals, with some exceptions. Specifically, it does not regulate birds, mice, and rats bred for scientific purposes, or farm animals used in agricultural research . The PHS Policy has a broader scope, applying to a wider range of vertebrate species used in PHS-funded research.

Institutional Animal Care and Use Committees (IACUCs)

A cornerstone of the regulatory system is the requirement for institutions receiving federal funding for animal research to establish an Institutional Animal Care and Use Committee (IACUC). IACUCs are responsible for reviewing and approving research protocols to ensure they meet ethical and regulatory standards. They oversee all aspects of animal care and use, including:

• Protocol review
• Veterinary care
• Facility standards
• Training of personnel

Accreditation and Guidelines

While not legally mandated, accreditation by organizations like the Association for Assessment and Accreditation of Laboratory Animal Care International (AAALAC International) demonstrates a commitment to high standards of animal care and use. Institutions often follow guidelines such as:

• The Guide for the Care and Use of Laboratory Animals: This provides detailed recommendations for the care and use of laboratory animals.
• AVMA Guidelines for the Euthanasia of Animals: These guidelines, published by the American Veterinary Medical Association, provide recommendations for humane euthanasia methods .

Recent Updates

Animal Welfare Act guidelines for birds were introduced in 2023 , reflecting an ongoing effort to refine and improve animal welfare standards.

Looking Ahead

The regulatory landscape surrounding laboratory animal care continues to evolve. Ongoing discussions focus on refining the “3Rs” – Replacement, Reduction, and Refinement – to minimize animal use and improve welfare. Continued vigilance and adherence to established guidelines are essential for ensuring the ethical and responsible conduct of animal research.