Quality Documentation
Endotoxin Testing: What to Check in a Report
Endotoxin testing addresses a specific analytical question. It should be reviewed as its own result—not treated as another word for purity, sterility, or a blanket quality claim.
What an Endotoxin Test Measures
Bacterial endotoxin testing is designed to detect or quantify endotoxins associated with Gram-negative bacteria in a tested sample. The report should identify the tested material or lot, the method or laboratory context, the result, and any stated reporting or acceptance limit.
It Is Not the Same as Sterility
An endotoxin result and a sterility result answer different questions. A chromatographic purity result answers a different question again. These terms are often grouped together in casual conversation, but quality documentation is most useful when every result remains attached to its own method and scope.
A Simple Reading Checklist
Before relying on an endotoxin result, confirm that it is connected to the material and lot you are reviewing. Then read the units, method, result, and limit together. If the test was performed separately from the analytical COA, that distinction should be clear in the documentation.
- Match the product name and lot to the record.
- Check the reported result and units.
- Look for the method, laboratory, and reporting or acceptance limit.
- Do not use an endotoxin result as a proxy for identity, content, purity, or sterility.