From: Accuracy of Capillary and Arterial Whole Blood Glucose Measurements Using a Glucose Meter in Patients under General Anesthesia in the Operating Room Anesthes. 2017;127(3):466-474. doi:10.1097/ALN.0000000000001708 Figure Legend: Clinical concordance between capillary glucose meter (A) and arterial glucose meter (B) and reference glucose values as demonstrated by the Parkes error grid for type 1 diabetes mellitus. To meet ISO 15197:2013 accuracy guidelines, 99% of glucose meter values must fall within zone A (no effect on clinical action) or zone B (altered clinical action—little or no effect on clinical outcome). Zones C to E on the error grid represent progressively more serious insulin dosing errors that may lead to patient harm. Date of download: 10/19/2017 Copyright © 2017 American Society of Anesthesiologists. All rights reserved.