Lab Accreditation Preparation: A Realistic Timeline

How Long Does Accreditation Preparation Take?

The honest answer: 12 to 24 months for a first-time accreditation, depending on your starting point. Labs with an existing quality management system (even informal) will be on the shorter end. Labs starting from scratch or with significant gaps will need the full duration.

This timeline covers preparation for ISO 15189 (medical laboratories) and ISO 17025 (testing and calibration laboratories). The steps are largely similar, with ISO 15189 adding clinical-specific requirements.

Months 1-3: Assessment and Planning

Gap Analysis (Month 1-2)

Start by understanding where you stand. A gap analysis compares your current practices against the applicable standard, clause by clause.

How to do it well:

Use the actual standard text, not a summary. Go through each requirement.
Interview staff in each department. What they actually do may differ from what documentation says.
Review existing documentation (SOPs, forms, records) for completeness and currency.
Score each requirement: fully met, partially met, or not met.

Output: A gap report that identifies every area needing work, prioritized by effort and importance.

Project Plan (Month 2-3)

Convert your gap analysis into a project plan:

Assign responsibility for each gap to specific individuals
Set realistic deadlines (overambitious timelines cause burnout and shortcuts)
Identify resource requirements (training, equipment, software, consultancy)
Establish a project steering group with management representation

Secure management commitment now. Accreditation preparation requires dedicated time from staff across the laboratory. Without management support for this time allocation, the project will stall.

Months 3-8: Building the System

Documentation Development (Months 3-6)

Write or revise the documentation required by the standard:

Quality Manual - Your overarching document describing the QMS scope, policies, and structure. Keep it high-level; detailed procedures belong in SOPs.

Standard Operating Procedures (SOPs) - Step-by-step instructions for every process referenced by the standard. Write them for the person who will actually perform the procedure. Use clear language, include decision points, and reference forms and records.

Forms and Templates - Standardized formats for data recording, reporting, and quality management activities.

Quality Policy - A concise statement of your laboratory's commitment to quality. Must be communicated to all staff.

Tip: Involve the people who will use the documents in writing them. Documents created in isolation by a quality manager are rarely practical.

Method Validation and Measurement Uncertainty (Months 4-7)

This is often the most technically demanding part of accreditation preparation:

Validate or verify every test method in your scope. Validation for non-standard methods; verification for standard methods to confirm they perform correctly in your lab.
Estimate measurement uncertainty for quantitative results. This requires statistical competence and sufficient data. Start early.
Document everything - validation protocols, raw data, calculations, acceptance criteria, conclusions.

Equipment Qualification (Months 4-6)

Calibrate all measurement equipment with traceability to national standards
Establish maintenance schedules
Document equipment qualification records
Set up environmental monitoring where required

Personnel Competence (Months 3-8)

Define competence requirements for each role
Assess current staff against requirements
Plan and deliver training to close gaps
Implement a system for ongoing competence assessment (annual reviews, proficiency testing participation)
Document everything: training records, competence assessments, authorizations

Months 8-10: Running the System

Implementation Period (Months 8-10)

With documentation in place, run the system as documented. This period generates the evidence that assessors will review:

Staff following SOPs in daily work
Quality control data accumulating
Proficiency testing results arriving
Nonconformity management working
Document control procedures functioning

Minimum operating history: Most accreditation bodies want to see 3-6 months of records demonstrating that the system is established and functioning. Plan your timeline accordingly.

Months 9-11: Internal Audit and Management Review

Internal Audit (Month 9-10)

Conduct a full internal audit covering every clause of the standard:

Use trained auditors (internal staff from different departments, or external auditors)
Audit against the standard requirements AND your own documented procedures
Document findings: conformities, observations, and nonconformities
Raise corrective actions for all nonconformities

This is your dress rehearsal. Treat it seriously. The better your internal audit, the smoother your external assessment will be.

Management Review (Month 10-11)

Hold a formal management review meeting covering:

Internal audit results
Customer feedback and complaints
Proficiency testing performance
Status of corrective and preventive actions
Process improvement opportunities
Resource adequacy
Risk assessment updates

Document the meeting minutes and any decisions or actions arising.

Months 11-14: Application and Assessment

Application (Month 11-12)

Submit your accreditation application to your national accreditation body. Include:

Completed application forms
Quality manual and supporting documentation
Scope of accreditation requested (specific tests, methods, matrices)
Organizational information

Expect a document review stage where the accreditation body reviews your documentation before scheduling an on-site assessment.

On-Site Assessment (Month 13-14)

The assessment team (typically 2-3 assessors for a small to mid-size lab) will:

Review your QMS documentation in detail
Interview staff at all levels
Witness testing procedures being performed
Examine records, equipment, and facilities
Verify traceability and competence

Expect nonconformities. Even well-prepared labs receive findings. What matters is how you respond.

Corrective Actions (Month 14+)

Address assessment findings within the timeframe specified by the accreditation body (typically 3-6 months). Provide evidence that corrective actions are effective.

Post-Accreditation

Accreditation is not the finish line. Maintaining accreditation requires:

Annual surveillance visits by the accreditation body
Continuous operation of your QMS
Regular internal audits and management reviews
Ongoing proficiency testing participation
Prompt handling of nonconformities

Assessing your readiness? Take our free Lab Digitization Assessment to evaluate where your lab stands and identify gaps to address before accreditation.

Key insight: Accreditation preparation is a marathon, not a sprint. A realistic timeline with consistent effort produces better results than a panicked rush. Start your gap analysis today, and work methodically toward your goal.