Figure 1.

Parkes Error Grid (left) and Clarke Error Grid (right) demonstrating inappropriate risk areas for assessing CGM in CHI patients. For PEG: A = no effect on clinical outcomes, B = altered clinical action with little or no effect on clinical outcome, C = altered clinical action likely to result in altered outcome, D = altered clinical action could have significant medical risk, E =could have dangerous consequences. For CEG: A = values within 20% reference of the sensor, B = outside 20% but would not lead to inappropriate treatment, C = would lead to unnecessary treatment, D = potentially dangerous failure to detect hypo or hyperglycaemia, E = would confuse treatment of hypo for hyperglycaemia and vice versa. The red outlined box indicates false negatives for hypoglycaemia (<3.5 mmol/L).Both charts contain areas which categorise these false negatives as low risk (shaded blue) or no risk (shaded red) which, in reality, could be dangerous for a patient with CHI. Both charts also have large risk areas associated with missed hyperglycaemia which pose minimal risk (shaded yellow and green) to patients with CHI and could be re-categorised as risk A or B.