How to Read a Certificate of Analysis (COA)
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How to Read a Certificate of Analysis (COA)
A Certificate of Analysis, commonly referred to as a COA, is an analytical document used to provide information about a specific sample or batch.
For research compounds, understanding what a COA contains — and what it does not — is an important part of evaluating analytical documentation.
1. Check the compound identity
The first step is confirming that the report clearly identifies the compound being analysed.
Depending on the analytical method used, identity may be assessed using techniques such as mass spectrometry.
The information on the analytical report should correspond to the product and batch it is intended to document.
2. Look at the Batch ID
A laboratory report is most useful when it can be connected to a specific batch.
The Batch ID displayed with a product should correspond to the analytical documentation provided for that batch.
This creates traceability between the research material and its associated documentation.
3. Understand purity
Purity results are commonly reported as a percentage.
One frequently used technique is High-Performance Liquid Chromatography (HPLC), which can separate components within a sample and estimate the relative proportion represented by the target compound.
It is important to remember that a purity percentage should always be interpreted in the context of the analytical method and report.
4. Purity and quantity are not the same
These measurements answer different questions.
Purity describes the relative composition of the analysed sample.
Quantity refers to the measured amount of material.
A high purity result does not, by itself, establish the quantity present in a vial.
5. Check the analytical method
A useful report should identify the analytical techniques used.
Depending on what is being evaluated, documentation may include methods such as:
HPLC — commonly used for chromatographic purity analysis.
Mass spectrometry — commonly used to provide information supporting compound identity.
Different analytical methods provide different information, which is why the methodology matters when interpreting a report.
6. Check that the documentation matches the batch
Analytical documentation should not automatically be assumed to represent every batch of a compound.
At ALVERYN LABS, available analytical documentation is presented at the batch level where applicable, allowing researchers to identify which documentation corresponds to a particular batch.
Research transparency
Our objective is to make available batch information clear and easy to access.
Where analytical documentation is available, it can be accessed through our Lab Reports section.
For laboratory and research use only. Not for human or veterinary use.