What is known as the procedure by which an approved testing laboratory provides documentation that a product or system conforms to specified requirements?

The procedure described in the question is best captured by the term "third party certified." Certification involves a recognized, independent organization verifying that a product or system meets specific requirements or standards. This certification implies a thorough evaluation and testing process carried out by the laboratory, ensuring that the product's performance, safety, and quality adhere to the specified standards.

While "third party tested" may suggest that the product has undergone testing by an independent entity, it does not necessarily indicate that the formal certification or documentation has been granted. Testing alone does not assure compliance without the subsequent review and validation process that comes with certification. Other terms like "third party verified" and "third party reviewed" also lack the comprehensive acceptance and formal recognition that "third party certified" conveys. Thus, certification represents the full process of evaluation leading to official validation of compliance with established requirements.