Certificate of Analysis (CoA)

What is a Certificate of Analysis (CoA)?

A Certificate of Analysis (CoA) is a critical quality assurance document provided with each batch of a chemical, reagent, or biopharmaceutical product. It details the results of analytical testing performed on that specific batch, including parameters such as purity, identity, assay, impurities, and other relevant specifications. The CoA is issued by the manufacturer or supplier and serves as proof that the product conforms to predefined quality standards, such as those set by USP, EP, BP, or ISO standards.

Why is a CoA important in procurement and lab workflows?

In B2B procurement, a CoA is essential for validating supplier reliability and ensuring compliance with regulatory requirements. For laboratories, especially in regulated environments like pharmaceuticals, diagnostics, or clinical research, a valid CoA is required to support data integrity and traceability. It enables users to verify that the product received matches the claimed specifications and has been tested using validated methods such as HPLC, GC-MS, or NMR. In cases of non-compliance or product failure, the CoA provides a documented basis for investigation and corrective action.

How does a CoA differ from a Certificate of Conformance (CoC)?

While a Certificate of Conformance (CoC) merely confirms that a product meets general specifications, a CoA provides actual test data from batch-specific analysis. A CoA is more detailed and scientifically rigorous, making it indispensable in regulated industries where audit trails and evidence-based quality control are mandatory.

Related concepts

A CoA is often accompanied by a Safety Data Sheet (SDS), a Batch Certificate, and a Certificate of Origin. It is also linked to quality management systems such as ISO 9001 and GMP, and is required under REACH, TSCA, and GHS regulations for chemical substances.