CGMs are increasingly used by people with type 1 diabetes (T1D) and type 2 diabetes (T2D), especially those requiring insulin, to improve and maintain good glycemic control.1–4 The currently available G6 CGM (Dexcom, Inc., San Diego, CA, USA) provides accurate readings, as demonstrated in earlier studies in adult5,6 and pediatric7 populations. This evidence concerns the gene INS and type 1 diabetes mellitus.