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Lab quality & accreditation

NABL Accreditation: — What It Actually Means for Your Biopsy

When a laboratory says it is NABL-accredited, that means an independent body has audited its processes and found they meet a defined standard. It is a credential you can verify yourself — and it is worth knowing what it covers and what it does not.

Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed September 2026

  • NABL is independent — Audits are conducted by external assessors appointed by NABL, not by the laboratory itself.
  • Scope is specific — Accreditation covers named test categories. A lab can be accredited for some tests and not others.
  • You can verify it — The NABL public directory lets you confirm any laboratory's accreditation status and validity yourself.
  • Process, not outcome — NABL certifies how the laboratory runs. It does not certify that every individual result is correct.
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NABL accreditation means the National Accreditation Board for Testing and Calibration Laboratories has independently audited a laboratory and found its processes, equipment and personnel meet a defined standard. It is a meaningful quality check, but it certifies how the lab runs, not the accuracy of every individual result it produces.

What does NABL accreditation actually mean?

NABL stands for the National Accreditation Board for Testing and Calibration Laboratories. It is an independent body under the Quality Council of India that audits laboratories against defined standards. When a laboratory is NABL-accredited, it means external assessors — not the laboratory itself — have verified that its processes, equipment and personnel meet those standards.

The audit covers documented procedures for handling samples, calibration of equipment, staff qualifications, and how errors are recorded and corrected. It checks whether the laboratory runs as it is supposed to run.

Accreditation has a validity period and must be renewed. A certificate that has expired is no longer current even if the lab still displays it.

How do you check whether a laboratory is NABL-accredited?

  1. Find the certificate number

    Look at the header or footer of any recent laboratory report — most print the NABL certificate number there. If you do not have a report, ask the laboratory reception.

  2. Open the NABL public directory

    Go to nabl-india.org and use the accredited laboratories search tool. No login is needed.

  3. Search for the laboratory

    Enter the laboratory name or certificate number. The result will show whether the laboratory is currently accredited and what its certificate status is.

  4. Read the scope carefully

    Each entry lists which test categories the accreditation covers. A laboratory can be NABL-accredited for some tests and not others. Confirm that the specific test your oncologist has ordered falls within the listed scope.

  5. Check the validity date

    Confirm the accreditation has not lapsed. An expired certificate means the laboratory's processes have not been reassessed for the period since expiry.

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What should you check before sending your biopsy to any laboratory?

  • Confirm the laboratory is NABL-accredited using the public directory at nabl-india.org
  • Verify the accreditation scope includes the specific test your oncologist has ordered — not just that the lab appears on the list
  • Check the validity date: the certificate should be current, not lapsed
  • Ask for the name and qualification of the pathologist who will report your slide
  • Confirm the final report will carry the pathologist's name, signature and NABL certificate number

Does NABL accreditation guarantee my biopsy result will be correct?

No, and no laboratory or accreditation body claims otherwise. NABL certifies that the laboratory follows good processes. It cannot certify that every individual test on every individual sample is correct.

A biopsy result also depends on things a process audit cannot measure: the experience and subspecialty training of the pathologist reading your slide, whether the tissue collected was representative of the tumour, and how the sample was handled between collection and the laboratory. None of those appear on an accreditation certificate.

What NABL accreditation does do is reduce the risk of errors that come from poor process. That is meaningful. It is a reasonable minimum to expect from any laboratory processing your biopsy — and it is a credential you can verify yourself rather than taking on trust.

Did you know?

NABL accreditation for medical laboratories is assessed against ISO 15189 — the international standard for quality and competence in clinical laboratories, used in most high-income countries.

NABL is also a signatory to the International Laboratory Accreditation Cooperation mutual recognition arrangement, which means the benchmark it applies is recognised globally.

Source: National Accreditation Board for Testing and Calibration Laboratories / Quality Council of India

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Common questions

Frequently asked questions

What is NABL and who runs it?

NABL is the National Accreditation Board for Testing and Calibration Laboratories, an independent body under the Quality Council of India that assesses and certifies laboratories. It does not run laboratories itself — it audits them. Laboratories apply for accreditation, undergo assessment by external technical assessors, and if they pass, are issued a certificate that must be renewed periodically. NABL operates under guidelines aligned with international standards and is recognised by the International Laboratory Accreditation Cooperation.

Does NABL accreditation cover biopsy and histopathology testing?

It can, but the scope matters. NABL accreditation is issued for specific test categories, not for everything a laboratory does. A laboratory might be accredited for some pathology tests and not others. When you check the NABL directory, look at the scope listed for that laboratory and confirm that histopathology — or the specific test your oncologist has ordered — appears in that list. If it does not, the accreditation does not apply to your sample.

Is a laboratory without NABL accreditation necessarily a poor-quality lab?

Not necessarily, but you have no independent verification of its processes. Some laboratories operate to high standards without NABL accreditation, but there is no way for you to confirm that yourself without the credential. NABL accreditation gives you something concrete to check. If a laboratory your oncologist uses is not NABL-accredited for the specific test on your biopsy, it is reasonable to ask why, and to ask whether a second-opinion review at a NABL-accredited laboratory is an option.

What should I do if I want a second opinion on my biopsy result?

Ask your oncologist whether a second-opinion review is appropriate for your situation. If it is, your original slides and blocks — the preserved tissue — can usually be sent to another laboratory for an independent read by a different pathologist. You do not need to repeat the biopsy procedure. Check that the second laboratory is NABL-accredited for histopathology and, if subspecialty expertise matters for your cancer type, ask about the pathologist's specific background. Your team can give you a realistic expectation of how long the process takes.

How do I know if a laboratory's NABL accreditation has lapsed?

Check the NABL public directory at nabl-india.org. Each entry shows the certificate number, accreditation scope and validity date. A laboratory whose certificate has expired will either not appear as currently valid or will show a lapsed date. The laboratory itself should also be able to show you a current certificate on request. If the certificate displayed on the wall or printed on a report is undated or old, ask to see the current version before your sample is sent.

Full index

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Every page in this section, grouped by the part of the journey it belongs to. Pick a group to see what is in it.

What Is a Biopsy?

What Is a Biopsy? Everything You Need to Know →

Types of Biopsy Compared

Which Biopsy Will You Have? Techniques Compared →

Preparing for a Biopsy

What to Expect on the Day of Your Biopsy →

Recovery and Aftercare

After a Biopsy: Recovery, Aftercare and Warning Signs →

Biopsy by Body Part

Biopsy by Body Part: What to Expect at Each Site →

Understanding Your Report

How to Read a Biopsy Report: Terms Explained →

IHC and Molecular Markers

IHC and Molecular Markers on a Biopsy: What They Mean →

Grading and Scoring Systems

Cytology & Prostate Scoring Systems Explained →

How Accurate Is a Biopsy?

How Accurate Is a Biopsy? Errors and Second Opinions →

If Your Result Is Benign

Your Biopsy Is Benign: What It Means and What Comes Next →

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