Figure 2: Results of an external quality assessment scheme run by INSTAND e.V. for HbA1c
The Youden-plot demonstrates the measurement results of two samples (sample 1 and sample 2) from 325 routine laboratories (red cross), their overall mean (black cross, 40.4 and 82.5 mmol/mol, respectively), and the results obtained by the IFCC reference measurement procedure (IFCC RMP value, green cross, 36.6 and 78.4 mmol/mol, respectively), and by the IDMS procedure (IDMS value, blue cross, 37.9 and 81.2 mmol/mol, respectively).