Further, we show an overall trend in improvement of proficiency in ERNDIM DPT schemes over the years, although poor performance for some samples remains.
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The role of ERNDIM diagnostic proficiency schemes in improving the quality of diagnostic testing for inherited metabolic diseases.
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Improvement of diagnostic proficiency over the years (2006–2020) The mean of overall proficiency across all schemes over the last 15 years (18–30 samples per year) shows a positive trend (slope = 0.7, R 2 = 0.6, Figure 1 ) and suggests an overall improvement in proficiency, although this needs to be very carefully interpreted.