Top 10 Mistakes Labs Make During ISO 15189 Accreditation (How to Fix)
Author : John Mills | Published On : 27 Mar 2026
Achieving ISO 15189 accreditation is a major milestone for medical laboratories, proving both technical competence and a strong quality management system. However, many labs struggle during the journey due to avoidable mistakes that delay certification, increase costs, or lead to audit failures.
Here are the top 10 mistakes that labs make while achieving the ISO 15189 accreditation and how they can be overcome:
1. Lack of Understanding of ISO 15189 Requirements
Mistake:
Many labs start implementation without fully understanding the standard, especially the updated ISO 15189 requirements.
Solution:
Invest time in training and clause-by-clause study. Use expert guidance or structured resources to interpret requirements correctly from the beginning.
2. Poor Gap Analysis
Mistake:
Skipping or rushing the gap analysis leads to missed requirements and last-minute surprises during audits.
Solution:
Conduct a detailed gap analysis covering technical and management requirements. Document all gaps and create a realistic action plan.
3. Incomplete or Weak Documentation
Mistake:
Labs often create generic or incomplete documents that do not reflect actual practices.
Solution:
Develop a complete documentation system including:
- Quality Manual
- SOPs
- Policies
- Records and formats
For labs struggling with documentation, getting structured templates and expert support for ISO 15189 accreditation can significantly reduce errors and save time.
4. Ignoring Staff Training and Competency
Mistake:
Assuming staff will “learn on the job” without formal competency evaluation.
Solution:
- Conduct regular training sessions
- Maintain competency records
- Perform periodic skill assessments
Remember: trained personnel are a core requirement of ISO 15189.
5. Weak Internal Audit System
Mistake:
Internal audits are treated as a formality rather than a powerful improvement tool.
Solution:
- Train internal auditors properly
- Use structured checklists
- Focus on identifying real gaps, not just compliance
A strong internal audit system ensures you’re truly ready for accreditation.
6. Poor Handling of Nonconformities (NCs)
Mistake:
Labs fix issues superficially without identifying root causes.
Solution:
Apply proper Corrective Action (CAPA):
- Identify root cause (not symptoms)
- Implement corrective actions
- Verify effectiveness
This prevents recurring audit findings.
7. Lack of Quality Indicators Monitoring
Mistake:
Not tracking measurable performance indicators like turnaround time, error rates, etc.
Solution:
Define and monitor key quality indicators such as:
- Sample rejection rates
- Reporting errors
- Turnaround time
Use data for continuous improvement.
8. Poor Equipment Calibration and Maintenance
Mistake:
Irregular calibration and missing maintenance records.
Solution:
- Maintain calibration schedules
- Keep traceability records
- Document preventive maintenance
This ensures accuracy and reliability of test results.
9. Last-Minute Audit Preparation
Mistake:
Preparing documentation and records just before the audit.
Solution:
Build the system gradually and maintain records in real time.
A well-implemented system should always be “audit-ready,” not rushed at the end.
10. Trying to Do Everything Without Expert Support
Mistake:
Many labs underestimate the complexity of ISO 15189 and attempt to manage everything internally without experience.
Solution:
Seeking professional guidance for ISO 15189 accreditation can help labs:
- Implement requirements correctly
- Prepare proper documentation
- Train staff effectively
- Reduce time to certification
Final Thoughts
The process of ISO 15189 accreditation goes beyond passing an audit, focusing on building a sustainable quality system that enhances patient care and laboratory performance.
Avoiding these common mistakes can make your accreditation journey smoother, faster, and more effective. With the right approach, proper planning, and expert support where needed, any laboratory can successfully achieve and maintain ISO 15189 accreditation standards.
