How to Read a COA?

Posted on June 7, 2026

A Certificate of Analysis (COA) is a document that summarizes test results for a product sample. It can help customers better understand what was tested, which methods were used, and what results were reported.

A useful COA should clearly identify the product tested, describe the tests performed, and present the reported results in a readable and meaningful format.

What should I look for on a COA?

A stronger COA will usually include:

• clear product identification

• the tests performed

• the methods used

• reported results

• the date of issue or testing

• the issuing laboratory or source

Is “lab tested” enough?

Not by itself. The phrase lab tested is more meaningful when it is supported by clear documentation, identifiable methods, and actual reported results.

What makes a COA stronger?

A stronger COA is clearly presented, identifies the product being tested, describes the test methods, and provides meaningful reported results.

What should I be cautious about?

Be cautious of:

• vague marketing claims

• polished graphics without much real detail

• missing dates or methods

• documents that do not clearly identify the issuing source

• statements like “Conforms” without supporting context

Is a COA the same as proof of overall quality?

A COA can be useful supporting documentation, but it should be read as part of the overall product information available.

How does Sterigenix view COAs?

At Sterigenix, we believe product documentation should be read as supporting information, not as a marketing graphic. The most useful COAs are clearly presented, identify the product tested, describe the methods used, and provide meaningful reported results.

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