Know what’s
in the report.
Independent laboratory testing, explained. Follow the sample, understand the measurements and find the certificate connected to your batch.
A clear connection.
Material. Measurement. Record.
From a sample
to a published record.
Testing produces a document you can inspect. Each stage keeps the submitted material connected to its laboratory findings.
- 01
Submit the sample
A sample associated with a batch is sent to an independent laboratory.
Material & identification - 02
Receive the analysis
The laboratory records its methods and findings in a certificate for the sample received.
Methods & measurements - 03
Review the record
Recorded values are checked against the certificate before the batch is released.
Document & release status - 04
Keep it accessible
The record links to the report and retains its history, including withdrawals or rejections.
A lasting reference
The original certificate sets the scope. A result describes the submitted sample and the tests performed.
Different measurements.
Different questions.
Identity, purity and quantity tell you different things. Read them together, using the methods and units on the certificate.
Does the sample match
the named compound?
An identity result addresses the compound detected in the submitted sample. Check the method actually performed; the certificate determines whether identity was assessed.
Method to look for LC-MS/MS, where reported
- Look for
- The named compound, method and identity result.
- Read alongside
- The sample identifier and the report’s stated scope.
- If absent
- Identity is not reported. A purity value does not fill that gap.
What does the
percentage describe?
Chromatographic purity describes the target’s share of the integrated signal under the stated method. Read the certificate’s definition and specification with the result.
Unit to look for Percentage (%)
- Look for
- The reported purity, method and acceptance specification.
- Keep separate
- The milligrams of peptide measured in the sample.
- Scope matters
- Purity does not stand in for tests of endotoxin, microbes or metals.
How much peptide
was measured?
Net peptide content is reported in milligrams. Fill accuracy compares that measurement with the amount stated on the label; it is a different percentage from purity.
Units to look for Content (mg) · Fill accuracy (%)
Measured content (mg)Labelled amount (mg)× 100 = Fill accuracy (%)
Compare the result with the certificate’s own specification. Do not substitute total sample weight for net peptide content.
Methods can differ between certificates. A test that was not performed remains not reported.
Start with
the lot number.
The lot on your vial should match the batch record and the certificate. A report number or verification code may look similar, but each has a different job.
Find your record- Lot number
- Identifies the material’s batch.
- Report or sample ID
- Identifies the laboratory document or submitted sample.
- Verification code
- Opens a record on the issuing service’s site, when provided.
If identifiers do not match, ask for clarification before taking the report as a match.
Find the original.
Use the batch ID printed on your vial to search the COA library.
Browse published reportsDoes one result describe every vial?
The certificate reports on the sample received and the analyses performed. Read its limitations; a result is not a measurement of every vial in a batch.
What if a test is missing?
A missing measurement stays marked as not reported. It should not receive a pass indicator or be inferred from another result.
Who carried out the analysis?
Read the certificate for the issuing service and the analysing laboratory. Where they are different organisations, the record should identify each by its role.
For laboratory research use only. Not for human or veterinary use.