Testing, explained.
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Understand the evidence behind a laboratory result. Explore testing methods and batch reports, with practical payment and order help whenever you need it.
Start with the certificate.
Match the batch. Identify the method. Read each result in context, from purity and identity to the limits of the test.
How to read a certificate of analysisFind your guide
Search testing methods, payment instructions and order help. Choose a topic to narrow the results.
18 guides · Showing 6 testing guides. Choose a topic or search to see more.
Multi-Vial Consistency, Sampling and Conformity
Compare measured milligrams with the labeled amount, disclose each vial’s overage or shortfall, and understand agreement across the tested vials.
Beyond HPLC: Water, Solvents, Elements and Quantity
Compare water determination, residual-solvent analysis, elemental-impurity testing and quantitative assays, including what to check in each laboratory report.
USP Testing Methods: A Guide to Common Chapters
Compare USP chapters for chemical analysis, microbiological tests, nucleic-acid methods and analytical validation, with conformity and reporting limits.
How to Read a Certificate of Analysis
Read a peptide COA: match the batch, distinguish HPLC purity from peptide quantity, and understand identity results, methods, and testing limitations.
How to Evaluate Third-Party Laboratory Testing
Evaluate third-party peptide testing: verify the batch, laboratory, methods, and actual results, and understand what a certificate does not establish.
HPLC, Mass Spectrometry and Reported Purity
Understand HPLC-UV, retention time, separation modes, peak area, LC-MS and MS/MS, and why purity, identity and measured content differ.
Different tests.
Different answers.
Choose a method to see the question it answers. These are general explanations; your batch certificate shows which tests were actually performed.
What separated in the sample?
Chromatography separates sample components. A reported area percentage describes the detected signals under that method, rather than every substance in the container.
- What to look for
- Detector, chromatogram, integration method and reported purity basis.
- Where the result stops
- Area purity alone does not establish identity, quantity, sterility or endotoxin levels.
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Go deeper into the evidence.
Connect each result to its sample, method and limits. Find a batch certificate or explore how laboratories measure and compare results.