NABL Certificate Number and ULR Changes 2026: What Calibration Labs Need to Update
Updated: 13 September 2026
Accreditation identifiers often look like a small administrative detail until they are embedded in hundreds of reports, labels, procedures, software fields and customer records.
That is why a change in the accreditation certificate number can create more work than simply editing one certificate template.
For a calibration laboratory, the identifier may appear in:
- calibration certificates;
- NABL symbol artwork;
- LIMS or calibration-management software;
- controlled report templates;
- website accreditation claims;
- quotation and tender documents;
- customer master-data systems;
- ULR generation logic;
- audit and verification records.
NABL's 2026 announcements make this an important transition topic for accredited laboratories and customers who verify accreditation.
What did NABL announce in 2026?
NABL's current News & Announcements page lists three closely related updates:
- 12 June 2026: announcement regarding the NABL symbol with respect to the new format of the NABL accreditation certificate number;
- 15 June 2026: clarification on ULR number based on the new certificate-number format;
- 6 July 2026: announcement regarding the new format of the accreditation certificate number.
This sequence is important because the certificate number is not an isolated field.
It interacts with the way the laboratory claims accreditation and with the identifiers used on accredited reports.
What was the older NABL certificate-number convention?
NABL's earlier published process documentation shows familiar field-based certificate identifiers such as:
- TC-XXXX for testing laboratories;
- CC-XXXX for calibration laboratories;
- MC-XXXX for medical testing laboratories;
- PC-XXXX for proficiency testing providers;
- RC-XXXX for reference material producers.
For calibration laboratories, the important historical identifier has therefore been the CC accreditation certificate number.
The 2026 NABL announcements indicate that the accreditation certificate-number system has changed, so laboratories should not assume an older template remains current simply because it was correct in a previous accreditation cycle.
What is a ULR?
ULR stands for Unique Laboratory Report number.
It is separate from the laboratory's own internal report or calibration certificate number.
In practical terms, this means one accredited calibration certificate can contain more than one identifier serving different purposes.
| Identifier | What it identifies |
|---|---|
| Accreditation certificate number | The accredited conformity assessment body or accreditation certificate issued by NABL. |
| Laboratory certificate/report number | The laboratory's own controlled identifier for that specific calibration certificate or report. |
| ULR | An additional unique laboratory-report identifier used in the NABL reporting system for accredited reporting. |
These identifiers should not be substituted for one another simply because they appear on the same document.
Why did NABL issue a separate ULR clarification?
NABL's announcement title explicitly says that the ULR clarification is based on the new certificate-number format.
That tells laboratories that a numbering change can affect downstream report-identification logic.
If a LIMS or calibration application generates ULR information using a stored accreditation identifier, the software configuration may need review.
The same applies to spreadsheet macros, report templates, barcode systems or custom databases that build identifiers automatically.
What should calibration laboratories review first?
The fastest way to manage the change is to map every place where the old accreditation identifier is stored, displayed or used by software.
- Current NABL accreditation certificate.
- NABL scope of accreditation.
- Calibration certificate template.
- NABL symbol artwork used in accredited reporting.
- LIMS or calibration-management software master settings.
- ULR-generation configuration.
- Calibration labels where accreditation claims are made.
- Website and marketing accreditation statements.
- Standard quotation and tender text.
- Internal SOPs referring to the accreditation number.
- Customer master-data records.
- Electronic certificate interfaces and APIs.
Why LIMS and calibration software need special attention
A printed template is easy to inspect visually.
Software can hide an old identifier in several places.
It may be stored in:
- a laboratory master table;
- a report-header configuration;
- a ULR-generation function;
- a QR-code or barcode routine;
- a certificate-signing workflow;
- a customer portal;
- an export file used by another system.
If one location is updated and another is missed, the laboratory can produce inconsistent documents.
That is why software changes should be tested using a complete certificate workflow rather than checking only the visible header.
A practical software-validation check
After updating the accreditation identifier, generate a test certificate and review:
- the displayed accreditation certificate number;
- the NABL symbol area;
- the laboratory's own certificate number;
- the ULR field;
- QR codes or barcodes;
- PDF metadata if used;
- electronic export files;
- customer-portal display;
- search and retrieval using both current and historical identifiers.
This catches a common transition problem: the document looks correct, but the underlying data or downstream interface still contains the old value.
What does NABL say about accreditation claims?
NABL's published policy on use of the NABL symbol and claims of accreditation states that accreditation claims should relate only to the accredited CAB and location covered by the scope.
Earlier NABL policy examples also show the accreditation certificate number accompanying narrative claims of accredited status.
This makes certificate-number updates relevant to:
- websites;
- brochures;
- email signatures;
- tender submissions;
- customer presentations;
- quality documents.
A laboratory should therefore review more than its calibration certificate template.
The NABL symbol and the NABL logo are not the same thing
NABL documentation distinguishes the NABL logo from the accreditation symbol used by accredited conformity assessment bodies.
Accredited CABs are authorised to use the NABL accreditation symbol subject to NABL policy.
Laboratories should not treat the NABL corporate logo as a substitute for the authorised accreditation symbol.
This distinction is particularly important during a numbering transition because old artwork may contain an outdated certificate identifier.
What should customers verify on a NABL calibration certificate?
A customer should not decide that a calibration is accredited only because a NABL symbol or number appears somewhere on the document.
The more useful verification process is:
- Identify the laboratory name and location.
- Identify the current NABL accreditation certificate number.
- Check the laboratory in NABL's accredited-laboratory search.
- Open the current scope of accreditation.
- Confirm that the required calibration discipline, parameter, range and capability are within scope.
- Check that the certificate itself relates to that accredited service.
Accreditation is scope-specific and location-specific.
A valid accreditation certificate number does not mean every measurement performed by that organisation is automatically covered by accreditation.
Why scope verification matters more than memorising the number format
A numbering format can help identify a certificate, but it does not tell the full technical story.
A calibration buyer normally needs to know whether the laboratory is accredited for:
- the required instrument or parameter;
- the required measurement range;
- an uncertainty suitable for the application;
- the relevant calibration location or mode of service.
Those details come from the current scope of accreditation, not from the certificate number alone.
What information should a calibration certificate contain?
NABL's 2026 guide for management-system documentation for testing and calibration laboratories includes specific reporting considerations for calibration certificates.
Examples include:
- measurement uncertainty;
- relevant environmental conditions;
- a statement identifying metrological traceability;
- results before and after adjustment or repair, if available;
- statement of conformity where applicable;
- opinions and interpretations where provided.
This reinforces an important point:
The accreditation number and ULR help identify and trace the report, but they do not replace the technical content needed to understand the calibration result.
What should a lab do with historical certificates?
A transition to a new accreditation identifier should not destroy historical traceability.
Laboratories should retain the ability to retrieve earlier reports issued under an older valid identifier.
Useful controls may include:
- keeping the old identifier in the laboratory master history;
- recording the effective date of the new identifier;
- keeping historical report templates read-only;
- mapping previous and current identifiers in the LIMS;
- training customer-service staff to explain the transition.
Do not rewrite historical calibration certificates only to make them resemble the current format unless a controlled correction or reissue is technically and procedurally justified.
How should document control handle the change?
A certificate-number transition should be treated as a controlled change.
A practical document-control record can identify:
- the external NABL announcement that triggered the change;
- affected documents and systems;
- the responsible person;
- the implementation date;
- software changes;
- validation checks;
- staff communication;
- retention of previous versions.
This provides evidence that the transition was reviewed systematically rather than handled through informal edits.
Should calibration laboratories change old CC-number references everywhere?
Not blindly.
Current public-facing and operational information should match the laboratory's current NABL-issued accreditation details.
Historical records should remain historically accurate.
For example, a calibration certificate issued in a previous valid accreditation period may correctly contain the identifier applicable at that time.
The correct action is controlled transition and traceability, not uncontrolled replacement of every historical reference.
What should procurement teams do?
Procurement databases often store supplier accreditation numbers.
If the accreditation identifier changes, the supplier can appear to be a new or unmatched laboratory unless the customer updates its master record.
Procurement and supplier-quality teams should:
- request the current accreditation certificate or verify it through NABL;
- update supplier master data;
- retain the previous identifier as historical reference if needed;
- verify the current scope, not only the new number;
- avoid rejecting a valid certificate simply because the identifier format differs from an old internal template.
Common mistakes during the transition
- Updating the PDF template but not the LIMS master record.
- Updating the certificate number but forgetting the NABL symbol artwork.
- Using an old accreditation claim on the website.
- Assuming the ULR and accreditation certificate number are the same identifier.
- Rejecting historical reports because they use a previous valid format.
- Checking only the number and not the current scope of accreditation.
- Copying an unofficial format example from social media instead of using the NABL-issued certificate.
A transition checklist for calibration laboratories
- Obtain and archive the current NABL accreditation certificate.
- Review the 12 June, 15 June and 6 July 2026 NABL announcements.
- Verify the current NABL symbol representation.
- Verify current ULR-generation requirements.
- Update calibration certificate templates.
- Update LIMS and calibration software.
- Validate generated certificates end to end.
- Review website and marketing accreditation claims.
- Update controlled SOPs where the identifier is hard-coded.
- Notify key customers if supplier master data may need updating.
- Preserve mapping to previous accreditation identifiers.
- Check the current NABL scope after the update.
Why this change is bigger than a number
Accreditation identifiers sit at the intersection of technical reporting, software, document control and customer verification.
That makes a format change a small digital-transformation problem inside the laboratory.
Laboratories with well-controlled master data can update one source and propagate the correct value consistently.
Laboratories with the same accreditation number copied manually into many templates are more likely to produce mismatched documents.
The 2026 NABL change is therefore a useful test of how well laboratory information is controlled.
Frequently asked questions
Did NABL change its accreditation certificate-number format in 2026?
Yes. NABL's official News & Announcements page lists an announcement regarding the new format of the accreditation certificate number dated 6 July 2026.
Did NABL also change ULR requirements in 2026?
NABL published a clarification on ULR number based on the new certificate-number format on 15 June 2026. Laboratories should use the current official NABL clarification and their NABL-issued accreditation details when configuring ULR generation.
What was the older certificate number for a NABL calibration laboratory?
Earlier NABL process documentation shows calibration-laboratory accreditation symbols using a CC-XXXX style certificate identifier. Laboratories should use their current NABL-issued certificate rather than assuming the older format remains applicable.
Is ULR the same as the laboratory calibration certificate number?
No. The ULR is an additional report-identification mechanism in the NABL reporting system. A laboratory may also maintain its own controlled calibration certificate or report number.
How should a customer verify a NABL calibration laboratory?
Identify the current laboratory and accreditation certificate number, use NABL's accredited-laboratory information, and review the current scope to confirm that the required calibration parameter, range and capability are covered.
Should a laboratory copy a new certificate-number example from social media?
No. Use the current NABL-issued accreditation certificate and official NABL instructions. Unofficial examples may be incomplete, transitional or wrong for a particular CAB category.
Sources checked
- NABL: News & Announcements . The page lists the 2026 certificate-number, NABL symbol and ULR announcements.
- NABL 100B: Accreditation Process & Procedure . Earlier published documentation shows field-based accreditation-symbol identifiers including CC for calibration laboratories.
- NABL 133: Policy for Use of NABL Symbol and / or Claim of Accreditation .
- NABL 160A: Guide for Preparing Management System Document/Quality Manual for Testing/Calibration Laboratories , Issue Date 2 January 2026.
Editorial note: NABL administrative formats and reporting instructions can change. This article is based on official public NABL information available as of 13 September 2026. Laboratories should use their current NABL-issued accreditation certificate, current scope, official NABL announcements and applicable controlled documents for implementation.
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