How to Read a Certificate of Analysis (CoA)

A certificate of analysis tells you what was tested on the specific batch being supplied, not what a general specification says should happen.

Five fields to check

• Batch number: it must match the delivered material.
• Test parameters: they should cover what your application requires, such as marker content, microbiology or heavy metals.
• Test method: the number is meaningful only with the method used to produce it.
• Result versus specification: verify that the measured value sits within the approved range.
• Test date: check it against your shelf-life and release requirements.

Before you order

If a parameter your process or regulatory file needs is absent, ask for it before ordering rather than after the batch arrives.