Continuous subcutaneous glucose monitoring (CGM) is commonly used in diabetes care. Still there are concerns with regard to sensor accuracy especially in periods of hypo- and hyperglycaemia. The aim of this study was to assess accuracy of commonly used CGM systems in a diabetes camp in children with type 1 diabetes (T1D) ages 9-14 years.
Data was gathered during a 2-week summer camp under physicians’ supervision. Out of 38 children, 37 wore a CGM system while participating at the camp. Baseline characteristics: age: 11.0 (9.9;12.1) years; 57% girls, HbA1c 7.2% (6.9; 7.7); diabetes duration: 3.6 (2.7; 6.3) years (median (interquartile range)). CGM was performed throughout the camp. Capillary glucose measurements were performed prior to main meals, at bedtime and when required by medical staff after thoroughly cleaning the finger tips. Calibrations of Medtronic Enlite was performed twice daily when glycemia was stable. All concomitantly available data pairs were used for the analysis.
Sensor distribution was 51% Abbott Libre, 35% Medtronic Enlite and 14% Dexcom G6. Sensor accuracy data are displayed in Table 1:
| Abbott | Dexcom | Medtronic | |
| All | 13.3 (6.7; 21.6) n=1165 | 10.3 (5.8; 16.7) n=242 | 8.5 (3.6; 15.6) n=671 |
| <70mg/dl | 17.7 (9.0; 27.7) n=210 | 18.7 (10.1; 23.5) n=21 | 15.0 (9.9; 30.0) n=62 |
| 70-180mg/dl | 13.2 (6.7; 21.3) n=692 | 9.8 (5.9; 15.4) n=178 | 7.6 (3.2; 14.5) n=419 |
| >180mg/dl | 11.2 (5.5; 17.7) n=263 | 11.1 (4.7; 17.0) n=43 | 8.6 (3.9; 14.9) n=190 |
Sensor performance of the adequately calibrated Medtronic system outperformed the factory-calibrated sensors. All sensors performed worst in hypoglycemia.