How to Verify Peptide Lab Results: A Step-by-Step Guide

A laboratory report is only as valuable as its authenticity. In the research peptide space, fabricated or recycled certificates of analysis are a known problem — a report that looks professional but is not tied to an actual analysis of the specific sample in question provides no meaningful information.

This guide covers how to verify peptide lab results methodically: what to check in the document, how to assess whether the report is genuine, and what online verification tools look like in practice.

Step 1: Verify the Laboratory

The first check on any peptide CoA is the issuing laboratory. A legitimate analytical laboratory will have:

• A legal name and registered address
• Contact information (phone, email, website)
• An accreditation or registration relevant to analytical chemistry

Search for the laboratory independently — do not rely only on the contact information printed on the report. Confirm the laboratory exists and is reachable through publicly available information. If the laboratory name returns no results, or if the contact details don't match public records, the report requires further scrutiny.

Step 2: Check Report Completeness

A complete peptide analysis report contains:

• Sample identification — the peptide name, lot or batch number, and sample reference
• Testing methods — which analytical methods were used and under what conditions (column type, gradient, detection wavelength for HPLC; ionisation method for MS)
• HPLC purity result — expressed as a percentage with at least one decimal place, accompanied by a chromatogram image
• Mass spectrometry data — observed molecular weight, expected molecular weight, confirmation of match
• Testing date — when the analysis was performed
• Analyst or laboratory signatory — who is responsible for the results

A report missing any of these elements is incomplete. Missing elements are not automatically evidence of fabrication — but they are reasons to seek clarification before treating the report as reliable.

Step 3: Scrutinise the Numbers

Genuine analytical results have specific characteristics:

• Purity percentages have decimal precision — real HPLC results are reported to one or two decimal places (e.g., 97.3%, 98.65%). A result of exactly 99.00% or 100% with no decimal variance is unusual and warrants scrutiny.
• The main peak area should be consistent with the stated purity — if a chromatogram image is provided, the relative peak areas should visually align with the stated purity value.
• Impurity peaks should be present at low levels — a chromatogram showing only a single perfect peak with no baseline impurities is unusual for commercial-grade peptides.
• Mass spec data should include specific m/z values — a statement of "confirmed" without supporting data (observed MW, expected MW, m/z values) is not a meaningful identity confirmation.

Step 4: Verify the Report Online

The most robust verification method is an online check system that ties a specific report to a specific sample submission. This is distinct from a supplier simply posting a PDF on their website — online verification means the issuing laboratory maintains a portal where the report can be retrieved independently using a unique reference number.

At Peptest, every report issued through our service is verifiable at the Analiza Białek verification portal. Each report has a unique order number and password. Anyone with these credentials — the original customer or anyone they share the report with — can retrieve the report directly from the laboratory's system and confirm it is authentic, unmodified, and linked to the specific sample submitted. The verification record includes a photograph of the physical sample as received.

This means the report cannot be fabricated, reused from a different batch, or modified after issuance — the original record at the laboratory is the reference point.

Step 5: Check Date Relevance

A CoA is relevant to the specific batch tested at the time of testing. A report from 12 months ago does not confirm the quality of material available today — synthesis batches change, storage conditions vary, and degradation occurs over time.

When evaluating a CoA provided by a supplier for a current purchase, check whether the testing date corresponds to the batch currently being sold. A report dated long before the current stock was produced cannot be applied to that stock.

Summary

Verifying peptide lab results involves five steps: confirm the laboratory is real and independently contactable; check the report contains all required elements; scrutinise the numerical data for consistency; verify the report online where an authentication system exists; and confirm the testing date is relevant to the batch in question. A report that passes all five checks provides meaningful analytical evidence. A report that fails any of them should be treated with appropriate caution.