Figure 6.

Bias for the 2 POC techniques and the 2 central lab techniques as compared to the NGSP. The NGSP compares values obtained with each commercial technique to the results of testing fresh whole blood samples, tracing back to the standard HPLC technique. The difference from the standard technique is considered the “bias” of the sample. The bias is reported for a low, midrange, and a high HbA1c sample. The bias levels are published twice annually. We plotted the bias results over time for the 2 techniques. (a) Afinion bias. (b) DCA bias. (c) Biorad bias. (d) DCA bias.