Quick Answer
NABL accreditation (ISO/IEC 17025) is specific to laboratories and proves technical competence to perform calibration/testing. ISO 9001 is a quality management system for any organisation. For ISO 9001 audits, GPCB compliance, and export compliance (FDA, EU), you need NABL-accredited calibration certificates — an ISO 9001 certificate for a calibration lab alone is NOT sufficient proof of traceability.
Key Takeaways
- NABL accreditation (ISO/IEC 17025:2017) and ISO 9001:2015 certification are fundamentally different — one is for lab technical competence, the other is for quality management systems.
- ISO 9001 Clause 7.1.5.2 requires calibration references traceable to international standards — NABL accreditation satisfies this requirement directly.
- A calibration lab with only ISO 9001 (no NABL) cannot issue calibration certificates that satisfy ISO 9001 audit requirements for traceability.
- For USFDA, EU GMP, and pharmaceutical export compliance, NABL certificates with ILAC MRA sign are the accepted proof of traceability.
- A company can hold ISO 9001 certification AND use an NABL-accredited lab for its instrument calibration — these are not alternatives, they are complementary.
What is NABL Accreditation?
NABL stands for National Accreditation Board for Testing and Calibration Laboratories. It is India's national accreditation body operating under the Department for Promotion of Industry and Internal Trade (DPIIT), Government of India. NABL accreditation is granted to laboratories — not to manufacturing companies — and certifies that the laboratory meets the requirements of ISO/IEC 17025:2017 (General Requirements for the Competence of Testing and Calibration Laboratories).
NABL accreditation is instrument-specific and scope-specific. A lab must demonstrate technical competence for each measurement category it claims to be accredited for. The CC number (e.g., CC-2480 for Prism Calibration Centre) is assigned to each accredited lab and is verifiable on nabl.org.in. NABL is a signatory to the ILAC MRA, meaning NABL certificates are accepted in 100+ countries.
Key Point
NABL accreditation is about TECHNICAL COMPETENCE: does the lab have the right reference standards, trained personnel, calibrated equipment, and documented procedures to produce accurate, traceable calibration results? ISO/IEC 17025 covers measurement uncertainty, reference standard traceability, environmental controls, and test method validation.
What is ISO 9001 Certification?
ISO 9001:2015 is an international standard for Quality Management Systems (QMS). It applies to any organisation — manufacturers, service providers, hospitals, schools, laboratories, or software companies. ISO 9001 certification means the organisation has a documented, audited quality management system that meets the requirements of ISO 9001:2015.
ISO 9001 covers: leadership and planning, customer focus, process approach, risk management, document control, corrective action, and continual improvement. It does NOT certify technical competence for specific activities — a packaging company, a hospital, and a calibration lab can all hold ISO 9001 certification, but that does not make the calibration lab technically competent to measure accurately.
Common Misunderstanding
Many calibration labs claim 'ISO 9001 certified' in their marketing and customers assume this is equivalent to NABL accreditation. It is NOT. ISO 9001 certifies the lab has a quality system — it does NOT certify that the calibration results are technically accurate or traceable to national standards. An ISO 9001 lab certificate alone does NOT satisfy ISO 9001 Clause 7.1.5.2 traceability requirements.
NABL vs ISO 9001 — Direct Comparison
| Parameter | NABL Accreditation (ISO/IEC 17025) | ISO 9001 Certification |
|---|---|---|
| Who holds it | Calibration / Testing laboratories only | Any organisation (manufacturer, lab, hospital, etc.) |
| What it certifies | Technical competence to perform specific calibration/testing | Quality management system is documented and followed |
| Issued by | NABL (India's national accreditation body) | Any NABCB-accredited certification body (Bureau Veritas, TÜV, SGS, etc.) |
| Standard | ISO/IEC 17025:2017 | ISO 9001:2015 |
| Instrument-specific? | Yes — scope covers specific instruments and ranges | No — applies to entire organisation's QMS |
| Measurement uncertainty | Mandatory on every certificate | Not required |
| Traceability chain | Documented traceability to NPL/BIPM | Not directly required |
| Accepted for ISO 9001 audits | Yes — satisfies Clause 7.1.5.2 directly | No — ISO 9001 lab cert alone is insufficient |
| Accepted for USFDA/EU GMP | Yes (with ILAC MRA sign) | No |
| Verifiable online | Yes — nabl.org.in (CC number) | Certificate-by-certificate from CB |
Which Certificate Do You Need — For Your Specific Situation?
ISO 9001 Audit
You need NABL calibration certificates for your instruments. ISO 9001 Clause 7.1.5.2 requires calibration to be traceable to international measurement standards. NABL accreditation is the accepted proof. An ISO 9001 certificate for the calibration lab alone is NOT sufficient.
GPCB / BIS Compliance
GPCB and BIS require NABL-accredited test and calibration reports for compliance submissions. An ISO 9001 certificate from the lab does not satisfy GPCB requirements for environmental monitoring, stack emission testing, or product testing.
USFDA / EU GMP / WHO-GMP
International pharma inspectors require NABL certificates with ILAC MRA recognition. NABL is India's ILAC MRA signatory — NABL certificates are accepted as equivalent to accreditation from NIST (USA), DAkkS (Germany), UKAS (UK), etc.
Export / Customs Clearance
Export calibration certificates must be from an NABL-accredited or internationally recognised lab. ILAC MRA-signed NABL certificates from Prism (CC-2480) are accepted by customs authorities and foreign laboratories in 100+ countries.
Can a Calibration Lab Have Both NABL and ISO 9001?
Yes — and the best calibration labs do. NABL accreditation (ISO/IEC 17025:2017) and ISO 9001:2015 certification are complementary, not alternatives. ISO/IEC 17025:2017 already incorporates quality management requirements similar to ISO 9001, so NABL-accredited labs typically find ISO 9001 easier to achieve. However, NABL accreditation alone is a higher bar than ISO 9001 alone for laboratory work.
Prism Calibration Centre holds NABL accreditation CC-2480 under ISO/IEC 17025:2017. This means Prism's calibration certificates carry the technical credibility of NABL accreditation — the highest standard for calibration laboratories in India — and are accepted by all ISO, GPCB, FDA, WHO-GMP, and customs auditors.
Bottom Line
If you are an industrial company: get your instruments calibrated at an NABL lab. Your ISO 9001 certification requires it. If you are evaluating a calibration lab: ask for their NABL CC number and verify it on nabl.org.in. ISO 9001 certification for a calibration lab is good, but NABL accreditation is what your auditor will check.
Frequently Asked Questions
Does ISO 9001 require NABL calibration certificates?
ISO 9001:2015 Clause 7.1.5.2 requires that measuring equipment used for monitoring and measurement be calibrated or verified at specified intervals against measurement standards traceable to international or national measurement standards. Using an NABL-accredited calibration laboratory is the most accepted way to satisfy this requirement in India. ISO 9001 auditors routinely ask for NABL calibration certificates.
Is a calibration lab with ISO 9001 certification good enough for my audit?
No. ISO 9001 certification for a calibration lab certifies its quality management system — not its technical competence. An ISO 9001 certified lab without NABL accreditation cannot produce calibration certificates that demonstrate traceability to national measurement standards as required by ISO 9001 Clause 7.1.5.2 and GPCB/FDA regulations. Always use an NABL-accredited lab.
What is the difference between ISO 9001 and ISO/IEC 17025?
ISO 9001 is a quality management system standard applicable to any organisation. ISO/IEC 17025 is a competence standard specifically for testing and calibration laboratories — it includes all relevant ISO 9001 QMS requirements plus additional requirements for technical competence: measurement traceability, measurement uncertainty, method validation, reference standard management, and environmental controls. NABL accreditation is based on ISO/IEC 17025.
Can I use a non-NABL lab's certificate for ISO 9001 audits?
Technically, ISO 9001 allows calibration against 'international or national measurement standards' — if there are no national standards, you must document the basis for calibration. In practice, ISO 9001 auditors in India expect NABL accreditation as the standard proof of traceability. Using non-NABL labs creates a documentation risk and may result in non-conformances during audits.
Does Prism Calibration Centre have both NABL accreditation and ISO 9001 certification?
Prism Calibration Centre holds NABL Accreditation No. CC-2480 under ISO/IEC 17025:2017 — the international gold standard for calibration laboratories. Our certificates carry the NABL and ILAC MRA logos and are accepted by ISO 9001, ISO 14001, IATF 16949, GPCB, CPCB, USFDA, EU GMP, WHO-GMP, BIS, and customs authorities across 100+ countries.
Written by
Er. Parthiv Kinariwala
Managing Director · Prism Calibration Centre · NABL CC-2480 · Ahmedabad
Er. Parthiv Kinariwala founded Prism Calibration Centre in 2004 and has over 20 years of hands-on experience in calibration engineering, NABL accreditation, and industrial compliance. His team performs 10,000+ calibrations annually from the Vatva GIDC laboratory, serving 5000+ industries across Gujarat.
Prism Calibration Centre — Vatva GIDC, Ahmedabad
Prism Calibration Centre
F-101, Rudraksh Complex 2, Phase 3, GIDC Vatva, Near Jasoda Nagar Cross Road, Ahmedabad — 382445, Gujarat, India
Phone: +91 98245 26444
Email: info@prismcalibration.com
NABL: CC-2480 · ISO/IEC 17025:2017
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