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Reasons for Proficiency Testing Failures in Routine Chemistry Analysis in China.

Tingting Li1,2, Haijian Zhao1, Cuanbao Zhang1

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Proficiency testing (PT) failures in clinical laboratories are primarily due to internal laboratory issues, not the testing process itself. Addressing these technical and equipment-related errors is key to improving laboratory services and analytical performance.

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Area of Science:

  • Clinical Chemistry
  • Laboratory Quality Management

Background:

  • Proficiency testing (PT) is crucial for evaluating laboratory performance and ensuring service quality.
  • Understanding the root causes of PT failures is essential for implementing effective continuous improvement strategies.

Purpose of the Study:

  • To investigate the primary reasons behind proficiency testing failures in routine chemistry testing.
  • To identify areas for improvement in laboratory services based on PT outcomes.

Main Methods:

  • Laboratories participating in the National Center for Clinical Laboratories (NCCL) PT program in China were surveyed in 2016.
  • Participants were required to report and investigate errors following unsatisfactory PT performance.

Main Results:

  • Technical errors (37.4%) and equipment issues (23.6%) were the most common causes of PT failures.
  • Clerical (10.2%) and methodological (16.2%) errors also contributed significantly.
  • Issues unique to the PT process accounted for only 15.6% of all reported reasons.

Conclusions:

  • Proficiency testing failures are predominantly linked to internal laboratory operational problems rather than flaws in the PT system.
  • PT programs, such as the one sponsored by NCCL, serve as effective tools for assessing laboratory performance.
  • Laboratories must focus on enhancing their analytical performance and addressing internal deficiencies to reduce PT failures.