Continuous glucose monitoring (CGM) has undoubtedly changed the way of treating diabetes in the outpatient setting, and more evidence has emerged in support of its inpatient use, even in the intensive care setting. We would like to report first results of a pilot study testing the possibilities of CGM use and suitable application site in patients treated in intensive care unit (ICU) after major abdominal surgery - feasibility, safety, and accuracy of standard placement on the arm compared to an alternative site in the infraclavicular region.