User guide

The Clarke Error Grid was used to assess the clinical relevance of the differences between the Guardian RT
readings and the comparative YSI measurements. The Clarke Error Grid divides a correlation plot into 5 zones.
See following table.
Results in zones A and B are considered clinically acceptable, while results in zones C, D, and E are potentially
dangerous and, therefore, clinically significant errors. The Clarke Error Grid zones are labeled on the
correlation plot.
Zone
Description
A Clinically accurate, would lead to correct treatment decisions
B Would lead to benign decisions or no treatment
C Would lead to over-correction of normal glucose levels
D Would lead to failure to detect and treat high or low glucose levels
E Would lead to erroneous treatment decisions
Appendix A
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