NABL accreditation is the formal recognition, by the National Accreditation Board for Testing and Calibration Laboratories, that a medical laboratory meets ISO 15189:2022 — the international standard for quality and competence of medical laboratories. A lab applies online after it has run its quality system, done an internal audit and a management review, and passed at least one proficiency test in each discipline; NABL then reviews documents, assesses the lab on site and grants a certificate with an "MC" number. Since June 2026 the certificate is valid for four years, with surveillance and mid-cycle assessments in between. Fees in 2026 run from ₹6,000 to ₹2,20,000 for the application and ₹6,000 to ₹2,40,000 a year, by daily patient volume, plus assessment costs and GST. NABL is voluntary in general, but CGHS now requires it for empanelled standalone labs.
This guide is for pathologists, lab owners, hospital lab heads and quality managers. It covers eligibility, the process and fees, the M(EL)T entry-level route for small labs, the rules for the NABL symbol on reports, and what the 2022 standard and NABL 112A demand from the lab's software. Figures were checked against NABL's documents on 5 November 2026.
Key takeaways
- ISO 15189:2022 is now the only standard. The ILAC transition from the 2012 edition ended in December 2025, and every current NABL document for medical labs is written for the 2022 edition.
- Four-year cycle from June 2026. NABL raised the accreditation cycle from two to four years, with surveillance in year one, an on-site mid-cycle assessment in year two and a second surveillance in year three.
- Fees depend on patients per day: six bands from Micro (up to 25 patients a day) to Very Large (over 1,000).
- Small labs have an entry route. NABL M(EL)T recognition costs ₹15,000 for three years, but covers a fixed basic test list and excludes hospitals of 50 or more beds and medical-college labs.
- CGHS made NABL compulsory for standalone diagnostic labs from its 22 December 2025 order, and pays non-accredited providers 15% less.
- The LIMS is assessed too. NABL 112A requires an audit trail, role-based access, verified interfaces and half-yearly re-verification of the lab information system.
Who needs NABL accreditation?
For most labs NABL is voluntary, but the market increasingly treats it as a licence to compete:
- CGHS: an Office Memorandum of 22 December 2025 requires standalone diagnostic laboratories to be fully NABL-accredited in all cities to be empanelled. Labs in tier-III cities, the North-East, Jammu and Kashmir and Ladakh with M(EL)T recognition or a QCI recommendation can be empanelled provisionally and must get full NABL within a year. Super-speciality hospitals need NABL for their in-house labs. Labs must also run external and internal quality assurance.
- CGHS rates: from 13 October 2025, providers without NABH or NABL accreditation are paid 15% less than accredited ones.
- Hospitals seeking NABH usually accredit their lab too, and NABH's Digital Health Standards expect sample traceability and digital reports — see NABH Digital Health Standards.
- Corporate clients, insurers and referring doctors prefer accredited labs, and accreditation is a selling point to patients.
Eligibility: what must be in place before you apply
- A legally identifiable entity — the lab or its parent organisation.
- A working quality management system to ISO 15189:2022 and NABL 112A, with a quality manual, procedures and records.
- Proficiency testing: satisfactory performance (z-score below 2) in at least one PT or external quality assessment for every discipline you apply for, from an accredited PT provider, before applying.
- At least one internal audit covering all activities and one management review, completed before applying.
- Disclosure of any consultant who helped prepare the system.
- A full-time quality manager, which NABL's specific criteria add to the ISO requirements.
The NABL accreditation process, step by step
- Apply online on NABL's medical application portal (launched for ISO 15189:2022 applicants on 19 August 2025) using application form NABL 153, with the quality manual, scope, sample collection facilities and fees.
- Document review. NABL checks the application and quality manual; the lab gets seven days to fix gaps.
- Pre-assessment (optional). A short visit to check readiness. The lab submits corrective actions within 15 days.
- Initial assessment. Usually two days on site, by a lead assessor and technical assessors for each discipline. All declared sample collection facilities are assessed during the cycle, at least 5% before or at the initial assessment.
- Corrective action. The lab submits evidence of closing every non-conformity within 30 days.
- Accreditation Committee decision and issue of the certificate with a unique MC number and QR code.
- Surveillance and renewal. Apply for renewal at least six months before expiry.
NABL does not publish a total timeline. A lab with a mature quality system typically spends several months between application and certificate; most of the time goes in building records and finishing PT rounds, not in NABL's own steps.
NABL fees for medical labs (2026)
From NABL 100A as amended on 31 August 2026. All figures are plus 18% GST.
| Lab size (patients per day) | Application fee | Annual accreditation fee |
|---|---|---|
| Micro (up to 25) | ₹6,000 | ₹6,000 |
| Mini (26–50) | ₹10,000 | ₹10,000 |
| Small (51–100) | ₹18,700 | ₹20,000 |
| Medium (101–400) | ₹44,000 | ₹48,000 |
| Large (401–1,000) | ₹1,10,000 | ₹1,20,000 |
| Very Large (over 1,000) | ₹2,20,000 | ₹2,40,000 |
- Per sample collection facility: ₹200 at application and ₹1,000 a year.
- Mid-cycle fee at the end of year two, at the same rate as the application fee.
- Overhead of ₹11,000 per assessment.
- Assessment charges at actuals: travel and stay, plus honorarium of ₹5,500 a day for the lead assessor and ₹5,000 a day for each technical assessor. Micro and mini labs pay a lump sum of ₹20,000 and ₹25,000 respectively (₹11,000 for surveillance).
- Micro and mini labs are limited to two disciplines. NABL moved to an upfront payment system from 1 October 2026.
Validity and the new four-year cycle
NABL 100A (amendment of 17 June 2026) raised the accreditation cycle from two to four years and added the mid-cycle fee. NABL's assessment programme, published on 24 June 2026, schedules Surveillance-1 within 12 months, an on-site mid-cycle assessment of all disciplines between months 13 and 24, and Surveillance-2 between months 25 and 36. Desktop surveillance is allowed only for labs with at least ten years of uninterrupted accreditation and no adverse decision, and NABL can increase the frequency when it has concerns.
NABL M(EL)T: the entry-level route for small labs
NABL's Medical Entry Level Testing Labs (M(EL)T) programme, relaunched in December 2024 under NABL 128, recognises small labs for a basic scope:
- Fee: ₹15,000 for a three-year cycle, plus surveillance at actuals and GST.
- Scope: a fixed list — HIV-1 antibody, basic biochemistry, complete blood count, routine urine and rapid serology. It cannot be extended.
- Not eligible: medical-college labs, labs belonging to a corporate group, and labs of hospitals with 50 or more beds.
- Eligibility: satisfactory PT from an accredited provider within six months before applying.
- Not internationally recognised: M(EL)T is outside the ILAC and APAC arrangements. A lab can move to full ISO 15189 accreditation at any time.
Using the NABL symbol on lab reports
NABL 133 (amended 3 September 2024) sets the rules, and assessors check reports against them:
- Use of the symbol is mandatory on reports of accredited tests, with the certificate number in the form "MC-XXXX".
- Tests outside the accredited scope must go on a separate report unless clearly segregated; an asterisk or similar mark is not allowed on a report carrying accredited parameters.
- The symbol is only for the accredited location — never for franchisees or sub-contractors.
- It is printed in black and white, may be reproduced electronically, and must stop the day accreditation is suspended, withdrawn or expires.
What ISO 15189:2022 and NABL 112A expect from your LIMS
The 2022 edition moved the standard closer to ISO/IEC 17025:2017, built in point-of-care testing (previously ISO 22870), made risk management and quality indicators explicit, and made verification of the laboratory information system mandatory. NABL's specific criteria for medical labs, NABL 112A (issued 18 December 2024), add detail that touches the software directly:
| Requirement | What the LIMS must do |
|---|---|
| Sample identification and traceability | Unique ID and label per sample, with collection and receipt times recorded; a collection-time log travels with transported samples |
| Request information | Capture clinical details and any deviation in collection |
| Sample acceptance | Record samples whose integrity cannot be established; flag compromised samples on the report |
| Turnaround time | Track TAT as a quality indicator, alongside sample identification errors, downtime, complaints and PT performance |
| Critical results | Define, display and document communication of critical limits |
| Report content | All ISO 15189 report elements, plus the name and signature of the person authorising release; amended reports traceable to the original |
| Auto-verification | If used, reports marked "Auto verified", rules validated and reviewed annually, with a way to suspend it quickly |
| Information system (clause 7.6.3) | Manage workflow, quality and audit trail; every function verified after installation and re-verified half-yearly with at least ten sample or test types; analyser–LIS and LIS–HIS interfaces verified |
| Access control | Authenticated, role-based access; departed users deactivated; an audit trail linking each user to changes in patient data |
| Internal quality control | Two control levels on the day of testing and one per shift, Levey-Jennings charts reviewed daily, run rules documented |
| Retention | Request forms, worksheets and reports at least one month; IQC and EQA raw data one year or until the next assessment; histopathology and cytology five years; molecular genetic records ten years |
Not all of this lives in one system. Most labs run IQC in analyser software or middleware and keep EQA, calibration and reagent lot records in their quality-system files; the LIMS carries the patient side — identification, timestamps, TAT, results, authorisation, reports and audit trail.
A NABL readiness checklist
- Quality manual, SOPs and a primary sample collection manual written to ISO 15189:2022 and NABL 112A.
- A quality manager appointed and a risk register in use.
- PT or EQA enrolment for every discipline, with at least one satisfactory round before applying.
- IQC with daily Levey-Jennings review and documented run rules.
- Calibration certificates with raw data for balances, centrifuges, thermometers, pipettes and analysers.
- Sample labels, collection and receipt timestamps, and rejection records for every sample.
- TAT and other quality indicators measured monthly.
- Report formats with the authoriser's name and signature and the NABL symbol only on accredited tests.
- LIMS verification records, user access list and audit trail.
- Internal audit and management review completed and minuted.
Lab software from Kentron: Healthixio and Pathixio
Hospital labs run on Healthixio's pathology module, inside the hospital's own record: lab orders from OPD and IPD, reports with the order barcode, age- and gender-specific reference ranges with abnormal values flagged, provisional and final reports, sample collected and received times, the pathologist's signature, a QR code that opens the verified report, delivery on WhatsApp, the patient portal, and linking to the patient's ABHA. See the pathology module.
Standalone and chain labs use Pathixio, Kentron's lab software at lab.healthixio.com. For NABL work it offers barcode sample labels, sample receipt times, home-collection pickup tracking with a reason for every failed pickup, a TAT summary showing on-time and delayed reports, reference ranges and out-of-range flags, provisional and final reports, a lab-level NABL mark with a per-test NABL flag so scope is set test by test, QR verification, pathologist signatures, WhatsApp and email delivery, collection-centre records, an audit log of report creation and edits, and ABDM linking.
Neither product runs Levey-Jennings charts, EQA records, calibration logs or reagent lot tracking today; keep those in your quality-system records. Our guides to pathology lab software and HFR registration for labs cover the rest of the setup.
Frequently Asked Questions
Is NABL accreditation mandatory for pathology labs in India?
Not in general. It is voluntary, but CGHS requires full NABL for empanelled standalone labs from its 22 December 2025 order, pays non-accredited providers 15% less, and requires NABL for in-house labs of super-speciality hospitals.
How much does NABL accreditation cost for a small lab?
For a small lab of 51–100 patients a day, the 2026 fees are ₹18,700 for the application and ₹20,000 a year, plus ₹11,000 overhead per assessment, assessors' honorarium and travel, and 18% GST. Micro and mini labs pay less, and M(EL)T recognition costs ₹15,000 for three years.
How long is NABL accreditation valid?
Four years since NABL's June 2026 amendment, with surveillance in year one, an on-site mid-cycle assessment in year two and a second surveillance in year three. Apply for renewal at least six months before expiry.
What is ISO 15189:2022 and what changed from 2012?
ISO 15189:2022 is the current international standard for medical laboratories. It aligns with ISO/IEC 17025:2017, makes risk management explicit, absorbs point-of-care testing, strengthens patient focus and makes laboratory information system verification mandatory. The transition from the 2012 edition ended in December 2025.
What is NABL M(EL)T?
Medical Entry Level Testing Labs recognition is NABL's entry-level programme for small labs: ₹15,000 for three years, a fixed basic scope, not available to hospitals with 50 or more beds, medical colleges or corporate-group labs, and not recognised internationally.
Can a lab print the NABL logo on all its reports?
No. The symbol, with the MC certificate number, is mandatory on reports of accredited tests and must not appear on non-accredited tests. Non-accredited tests go on a separate report unless clearly segregated; asterisks are not allowed.
What does NABL check in the lab software?
Under NABL 112A, that the LIMS manages workflow and keeps an audit trail, that every function was verified after installation and is re-verified half-yearly, that analyser and HIS interfaces are verified, that access is role-based, and that departed users are deactivated.
How long does NABL accreditation take?
NABL does not publish a timeline. Once the application is complete, the review, assessment and corrective-action steps take weeks each; most labs spend several months, mainly building records and completing proficiency testing beforehand.
Get your lab ready for assessment
Hospital labs: book a demo of Healthixio's pathology module. Standalone labs: see Pathixio.
Sources
- NABL 100A, General Information Brochure (fees and cycle), amended 31 August 2026: nabl-india.org
- NABL 100B, Accreditation process and procedure: nabl-india.org
- NABL 112A, Specific criteria for medical laboratories, 18 December 2024: nabl-india.org
- NABL 133, Use of the NABL symbol: nabl-india.org
- NABL M(EL)T programme: nabl-india.org
- CGHS requirement for NABL accreditation (NABL notification): nabl-india.org
- ILAC on the ISO 15189:2022 transition: ilac.org
Last reviewed 5 November 2026. NABL amends its documents often; check nabl-india.org for the current issue.