What NABL accreditation actually covers
Accreditation is granted for a defined scope — the specific disciplines, tests and methods your laboratory is assessed for. Clinical biochemistry, haematology, microbiology, histopathology, molecular testing and others are each assessed separately. A lab is never 'NABL accredited' in general; it is accredited for the tests listed on its scope certificate.
The governing standard for medical laboratories is ISO 15189, which combines management-system requirements (documentation, records, audits, complaints, corrective action) with technical requirements (personnel competence, equipment, calibration, method validation, quality control and reporting).
- Scope defined test-by-test, discipline-by-discipline
- ISO 15189 for medical testing labs; ISO/IEC 17025 for calibration and non-medical testing
- Accreditation certificate lists the exact tests recognised
The pre-requisites most labs underestimate
Before applying, the laboratory needs a functioning quality management system that has actually been used, not just written. Assessors look for evidence over a period of operation: internal audit records, a management review, participation in proficiency testing, calibration certificates traceable to national standards, and documented competence assessment for every technician.
Three areas cause most delays: incomplete method validation or verification, gaps in internal quality control charting, and equipment calibration that is either overdue or traceable to an unaccredited provider.
- Quality manual, SOPs and forms in controlled circulation
- At least one full internal audit and one management review completed
- Proficiency testing / inter-laboratory comparison for each discipline
- Traceable calibration and documented uncertainty of measurement where applicable
- Competence records for every person performing or reporting tests
How the assessment process runs
After the online application and scope submission, NABL conducts a document review (adequacy assessment), followed by an on-site assessment by a lead assessor and technical experts covering each discipline in the scope. Findings are raised as non-conformities, classified by severity, and the lab submits corrective actions with evidence of root-cause analysis.
Once corrective actions are accepted, the accreditation committee reviews the file and grants accreditation for the approved scope. Accredited labs are then subject to periodic surveillance assessments and a re-assessment before the accreditation cycle ends.
- Application and scope definition
- Document / adequacy review
- On-site assessment per discipline
- Non-conformity closure with evidence
- Committee decision and certificate issue
- Surveillance and re-assessment thereafter
Realistic timelines and internal effort
For a lab starting without a formal quality system, building documentation, running the system long enough to generate records, and completing assessment typically spans several months to about a year. Labs that already run structured QC and have calibrated, well-maintained equipment move considerably faster.
The scarce resource is rarely money — it is a designated quality manager with protected time. Labs that assign accreditation as an extra duty to a busy technologist almost always slip.
Where consultancy support genuinely helps
A consultant cannot make an incompetent lab competent, but can compress the learning curve: structuring the QMS to the standard's clause order, designing QC and validation protocols that satisfy technical assessors, running mock assessments, and coaching staff on how evidence is presented on assessment day.
Think Tank provides NABH and NABL consultancy for hospitals, healthcare organisations and diagnostic laboratories in India — gap analysis, documentation, staff training, internal audits and assessment readiness.
Turning accreditation into patient trust
Accreditation is also a marketing asset. Publish your scope, display the certificate, and explain in patient language what NABL accreditation means for report reliability. Add it to your Google Business Profile description, your test pages and your schema markup — it is a differentiator most competing labs never communicate.
Key takeaways
- NABL accreditation for medical labs is assessed against ISO 15189
- Accreditation applies only to the specific tests in your approved scope
- Assessors want evidence of a system in use, not a binder of SOPs
- Proficiency testing, traceable calibration and competence records are non-negotiable
- Communicate accreditation publicly — it converts patients and referrers
Frequently asked questions
Is NABL certification the same as NABL accreditation?
People use the terms interchangeably, but NABL grants accreditation — formal recognition of technical competence for a defined scope of tests — rather than a certification of a management system alone.
Which standard applies to a medical testing laboratory?
Medical testing laboratories are accredited against ISO 15189. ISO/IEC 17025 applies to testing and calibration laboratories outside the medical testing category.
Can a small pathology lab get NABL accredited?
Yes. Scope is defined by the tests you actually perform, so a small lab can seek accreditation for a limited discipline set, provided it meets personnel, equipment, QC and documentation requirements.
Do we need NABH as well if we already have NABL?
They cover different things. NABL accredits the laboratory's testing competence; NABH accredits hospital or healthcare organisation quality. Hospitals with in-house labs often pursue both.