What ISO/IEC 17025 Accreditation Means for a Peptide Testing Laboratory

Supplier pages in this category lean on three words: “ISO”, “certified” and “accredited”. They are used interchangeably in marketing copy and they mean different things. This guide explains what ISO/IEC 17025 is, who grants accreditation against it, how to read a scope of accreditation, how to look a laboratory up, and why “ISO certified” on a supplier’s homepage is usually a different claim from “accredited laboratory” on a certificate of analysis.

The standard

ISO/IEC 17025 is titled “General requirements for the competence of testing and calibration laboratories”. The current edition is 2017. It is published jointly by the International Organization for Standardization and the International Electrotechnical Commission. The standard sets requirements in two broad areas. Management requirements cover the quality system: document control, records, handling of complaints, internal audits and corrective action. Technical requirements cover the parts that make a result trustworthy: staff competence, equipment calibration and maintenance, method validation, measurement traceability, measurement uncertainty, sampling, handling of test items and reporting.

A laboratory does not certify itself against 17025. It is assessed by an accreditation body, which sends assessors to review documents, observe methods, examine records and check proficiency-testing results. If the laboratory meets the requirements, the body issues a certificate and a scope. Surveillance visits follow, and reassessment is typically on a multi-year schedule.

Accreditation bodies

Accreditation bodies are national or regional organizations recognized through the International Laboratory Accreditation Cooperation (ILAC) Mutual Recognition Arrangement. Recognition through ILAC means a certificate from one body is intended to be accepted by the others. The bodies a reader is most likely to see on a peptide certificate are:

Body	Region	Public directory
A2LA (American Association for Laboratory Accreditation)	United States	Searchable by organization name and certificate number
ANAB (ANSI National Accreditation Board)	United States	Searchable directory with scope PDFs
PJLA (Perry Johnson Laboratory Accreditation)	United States	Searchable directory
IAS (International Accreditation Service)	United States	Searchable directory
UKAS (United Kingdom Accreditation Service)	United Kingdom	Searchable directory with schedules of accreditation
DAkkS (Deutsche Akkreditierungsstelle)	Germany	Searchable database
CAI (Czech Accreditation Institute)	Czech Republic	Searchable register
NATA (National Association of Testing Authorities)	Australia	Searchable directory

Each of these publishes a free, public directory. If a certificate names a body that has no public directory, or names no body at all, the accreditation claim cannot be checked.

Scope of accreditation

Accreditation is never general. A laboratory is accredited for a defined list of tests, each described by the technique, the type of material and, often, the specific method or standard. This list is the scope of accreditation, and it is published as a PDF or web page alongside the certificate.

The scope is where most buyers stop reading, and it is the part that matters. A laboratory can be accredited for environmental water testing, food microbiology or metals in soil and still issue a peptide purity certificate. The certificate would carry the accreditation logo and number, both real, while the HPLC purity method itself sits outside the accredited scope. Reputable laboratories mark which results on a report fall under the scope and which do not. Many do not bother.

When reading a scope for a peptide certificate, look for entries such as:

• Chromatography (HPLC or UHPLC with UV detection) applied to pharmaceutical materials, peptides or small molecules.
• Mass spectrometry (LC-MS or MALDI-TOF) for molecular weight or identity.
• Bacterial endotoxins by LAL (USP <85>) and sterility (USP <71>), if those results appear on the certificate.
• Water content by Karl Fischer titration, if reported.

If the scope covers none of the methods on the certificate, the accreditation adds nothing to that certificate.

How to look up a certificate

The process takes a few minutes.

1. Read the certificate header. Note the laboratory’s legal name, the accreditation body and the certificate or accreditation number.
2. Open the accreditation body’s public directory. Search by the laboratory name first, then confirm with the number.
3. Check the status. Directories show accredited, suspended, withdrawn or expired. A suspended or withdrawn status means the laboratory was accredited at some point but is not now.
4. Open the scope document. Find the technique used on the certificate and the type of material. Confirm the method on the COA is listed.
5. Compare the laboratory’s address in the directory with the address on the certificate. A branch at a different site may hold a different scope or none.

If the laboratory is not in the directory, the claim is unverified. If the laboratory is in the directory but the method is not in the scope, the result is from an accredited laboratory but is not an accredited result.

“ISO certified” versus “accredited laboratory”

The two phrases describe different things, done to different organizations, by different kinds of bodies.

	ISO 9001 certification	ISO/IEC 17025 accreditation
What is assessed	A quality management system	A laboratory’s technical competence for specific tests
Who can hold it	Any organization, including a supplier or distributor	Testing and calibration laboratories only
Who grants it	A certification body (itself accredited by a national body)	An accreditation body recognized through ILAC
What it says about test results	Nothing directly	That the listed methods were assessed for competence
Typical marketing phrase	“ISO certified”, “ISO 9001:2015 certified facility”	“ISO/IEC 17025 accredited laboratory, certificate no. …”

A supplier that says it is “ISO certified” is most often referring to ISO 9001 for its own business, or to a manufacturer’s certificate somewhere upstream. That is a legitimate claim about process documentation. It is not a claim about the laboratory that produced the certificate of analysis, and it does not make a purity result more reliable. In our records such statements are captured in the certifications_claimed field exactly as the supplier words them, and they are not scored as laboratory accreditation.

The reverse confusion also occurs. Some suppliers describe the contract laboratory as “ISO certified” when the laboratory is in fact 17025 accredited, which is the stronger statement. The fix is the same in both directions: find the certificate number and read the scope.

What accreditation does and does not establish

Accreditation establishes that a laboratory has validated methods, calibrated equipment, trained staff, traceable standards and a quality system, for the tests in its scope, as assessed at the last visit. That is a meaningful floor.

It does not establish that any single result is correct, that the sample tested came from the lot on the label, that the supplier sent a representative sample, or that the certificate on the supplier’s site is the certificate the laboratory issued. Each of those is a separate question. Our guide to reading a certificate of analysis covers the lot and date checks. Our red flags guide covers the case where no laboratory is named at all.

How this site scores accreditation

In each supplier’s record we note whether a laboratory is named on the certificates and whether that laboratory appears to hold ISO/IEC 17025 accreditation in a public directory. Naming a laboratory earns points in the testing factor; verifiable accreditation earns a few more. A supplier’s own “ISO certified” claim is recorded but earns nothing in the testing factor, because it describes the supplier and not the test. The full point table is on the methodology page. Suppliers whose certificate libraries are open to the public are listed at public COAs.

Summary

ISO/IEC 17025 accreditation is granted to laboratories, by recognized accreditation bodies, for a published list of tests. To use it, find the body, look up the laboratory, confirm the status and read the scope. “ISO certified” on a supplier homepage is a different claim about a different organization. Neither phrase, on its own, verifies a result; they tell you how much weight the laboratory’s name can carry.