Subchapter V - Proficiency Testing
- Section NR 149.22 - Required proficiency testing samples and frequency of analysis
- Section NR 149.23 - Approval of proficiency testing sample providers
- Section NR 149.24 - Proficiency testing samples for applications and accreditation renewal
- Section NR 149.25 - Treatment of proficiency testing samples
- Section NR 149.26 - Reporting proficiency testing sample results
- Section NR 149.27 - Proficiency testing sample acceptance limits and grading
- Section NR 149.28 - Procedure for correcting unacceptable proficiency testing sample results