Peptide Verification
Test Date, Report Date, and Batch Date: What’s the Difference?
Understand what each date on a certificate means and how to spot a timeline that needs further verification.
Short answer. The batch date is when the lot was made, the test date is when the lab analyzed the sample, and the report date is when the lab issued the certificate. Testing must follow manufacture, and the report should follow the test within days. A test date older than the lot, or a report dated before its own test, is a red flag.
What this means for your clinic. Write all three dates on the receiving record for every lot, in the order they happened. Dates are the cheapest check you have: they take thirty seconds to read, and a recycled or edited certificate almost always gets them wrong.
Which three dates matter, and where do they appear?
A certificate of analysis is a snapshot of one sample on one day. To know what the snapshot means you need to place it in time against the lot it describes, which is why the clinic’s guide to verifying peptides treats the dates as a field to verify rather than a header to skim.
| Date | What it records | Where you find it | Source that calls for it |
|---|---|---|---|
| Batch date, also called manufacture or release date | When the lot was made and, separately, when the manufacturer’s quality unit released it | Manufacturer’s certificate; sometimes the label | ICH Q7 11.41 (date of release on the certificate) |
| Test date | When the laboratory ran the analysis on the sample it received | Independent laboratory report, often with a separate date of receipt | ISO/IEC 17025 7.8.2.1 items (h) date of receipt and (i) date of performance |
| Report date | When the laboratory issued the certificate or report | The report’s header or signature block | ISO/IEC 17025 7.8.2.1 item (j) date of issue |
| Expiry or retest date | The date the manufacturer assigned from stability data | Label and certificate | ICH Q7 11.41; ICH Q1A(R2) definitions |
The fourth row is not one of the three in the title, but it is the date the other three are judged against. Expiration Date vs Retest Date: What Do They Mean on a Peptide? covers the difference between the two forms it takes.
What order should the dates run in, and what gaps are normal?
The sequence is fixed by physics. The lot is made. The manufacturer tests it and releases it, so the release date follows manufacture by days or weeks. A sample is drawn and shipped to an independent laboratory, which records the date it received the sample. The laboratory tests it, usually within days of receipt, and issues the report, usually within days of testing. Every date should be later than the one before it.
Normal gaps are small. Manufacture to release is typically days to a few weeks, since release testing takes time. Receipt at the lab to test date is typically days. Test date to report date is typically a day to a week. A long gap is not automatically wrong; it is a question. A sample that sat at the lab for two months before testing was stored somewhere, under some conditions, and the report should say so or you should ask.
A gap that runs backward is never normal. A test date earlier than the lot’s manufacture date means the sample tested was not from this lot. A report dated before its own test date means the document was edited or assembled from parts.
How recent should a certificate be?
The forum answer is a number of days, often under ninety. There is no source for that. The dates that matter are the lot’s own: a certificate issued at release describes the lot as it was released, and the lot remains within its expiry or retest date until the date the manufacturer assigned from its stability data. ICH Q1A(R2) defines the retest date as the date after which the material should be re-examined against its specification, and the expiration date as the date after which a finished product should not be used. Neither is a function of how old the certificate is.
So the question to ask is not “is this certificate recent” but “does this certificate belong to this lot, and is this lot still within the dating the manufacturer supports.” The first is the three-way match. The second depends on the stability study behind the date, which What Stability Data Should a Supplier Be Able to Show? explains. A certificate from eighteen months ago on a lot with a three-year retest date, supported by a real study, is in better standing than a certificate from last week on a lot with no dating at all.
Where a certificate is old and the lot is near its retest date, the right response is a retest against the specification, which produces a new certificate with new dates, not a fresh copy of the old one.
Which date patterns expose a recycled certificate?
Recycled certificates are old documents sent with new lots, sometimes unchanged and sometimes with the lot number edited. The dates give them away because whoever recycles a certificate rarely rewrites all three consistently.
Identical test dates across several products or several orders. One laboratory rarely tests six different products on the same day for the same supplier, order after order.
A test date that predates the lot. The certificate was written about an earlier lot and the lot number was changed.
A report date before the test date, or two date formats on one page (one written day-month-year, another month-day-year). Documents assembled from two sources carry two conventions.
A release date on the manufacturer’s certificate that falls after the independent report’s test date. The sample was tested before the manufacturer had released the lot, which can happen legitimately for pre-release testing, but should be explained.
When a pattern appears, the lot stays in quarantine and you confirm the report with the laboratory directly. How Can You Tell If a Peptide COA Is Real or Fake? puts date checks in their place among the four checks that settle the question, and Why Does a Product Have Multiple COAs? explains how several genuine certificates with different dates can exist for one product without any of them being recycled.
How Helios does it
Under the Helios verification standard, step 3 checks the dates as part of the three-way match: manufacture or release date, test date and report date must run in order and sit before the lot’s expiry or retest date. Step 7 records all of them in the lot register beside the lot number, the laboratory, the method, the report number and the verification date, so that the age of every certificate can be read from one row. Helios Consultants LLC describes all seven steps in how Helios verifies every lot. If you want help setting this up in your clinic, book a consultation.
Related questions
Why Does a Product Have Multiple COAs?
How Can You Tell If a Peptide COA Is Real or Fake?
Expiration Date vs Retest Date: What Do They Mean on a Peptide?
What Stability Data Should a Supplier Be Able to Show?
Sources
ICH Q7, Good Manufacturing Practice Guide for Active Pharmaceutical Ingredients, section 11.4. View source
NIST, ISO/IEC 17025:2017 crosswalk, clause 7.8 Reporting of results. View source
ICH Q1A(R2), Stability Testing of New Drug Substances and Products, glossary. View source
Educational content for licensed professionals. Not legal or medical advice. No product is offered for sale on this page.