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The existing (2010–2012) NGSP certification criterion (95% confidence interval of the differences between laboratory method and SRL within ±0.75% HbA1c) compared to the 2011–2012 CAP criterion of ±7%. The lines represent the bias and CV combinations required to pass the NGSP (—) and CAP (----) criteria with 0.95 (top, black), 0.99 (middle, dark grey) and 0.999 (bottom, light grey) probabilities.
