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<p>Proficiency testing (PT) is essential for evaluating laboratory performance and ensuring analytical reliability. However, in regions with economic and logistical limitations, routine participation in international PT schemes is often hindered by high costs and limited access. To address these barriers, this study explores the reuse of leftover materials from an accredited PT scheme for organizing a local PT round on zearalenone in cereals. This approach eliminates the need for separate homogeneity testing, as such validation is already ensured by the original PT provider. The outcomes, evaluated through z-scores and ẑ-scores in line with ISO/IEC 17043 and ISO 13528, confirmed the suitability of the reused materials and the overall validity of the approach. This model offers a cost-effective and efficient alternative for local PT rounds, aligns with ILAC's "accredited once, accepted everywhere" principle, and holds potential for broader application in other analytical domains.</p>

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Reusing authentic PT leftovers to design local schemes: a feasible strategy to optimize PT logistics and costs

  • 期刊论文

  • 发表日期：

    2025年9月30日

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  • Leila Fotouhi,
  • Sara Nemati,
  • Mohammad Mohammadalizadeh

摘要

Proficiency testing (PT) is essential for evaluating laboratory performance and ensuring analytical reliability. However, in regions with economic and logistical limitations, routine participation in international PT schemes is often hindered by high costs and limited access. To address these barriers, this study explores the reuse of leftover materials from an accredited PT scheme for organizing a local PT round on zearalenone in cereals. This approach eliminates the need for separate homogeneity testing, as such validation is already ensured by the original PT provider. The outcomes, evaluated through z-scores and ẑ-scores in line with ISO/IEC 17043 and ISO 13528, confirmed the suitability of the reused materials and the overall validity of the approach. This model offers a cost-effective and efficient alternative for local PT rounds, aligns with ILAC's "accredited once, accepted everywhere" principle, and holds potential for broader application in other analytical domains.