FLASH.V: Flash Glucose Monitoring and Surgery in the Hepatopancreaticobiliary (HPB) Surgery and Liver Transplant Population - Verification Study

This is an observational study which will look at the precision of a flash glucose monitoring sensor when patients are undergoing surgery. Each participant will have a flash glucose monitoring sensor applied to the upper left arm. The sensor is applied using the sensor applicator that is supplied with the sensor, in a sterile pack. A thin flexible sterile fibre (5mm long) is inserted just below the skin. Most patients reported that applying the sensor was painless. "In a 2013 US study conducted by Abbott Diabetes Care, 100% of the patients surveyed (n=30) rated that applying the sensor was painless or almost painless, and 93.4% of patients strongly agree or agree that while wearing the sensor, they did not feel any discomfort under their skin." (https://www.freestylelibre.com.au/) The sensor takes near continuous readings of the patients blood glucose levels. This will be compared at regular time points with standard of care blood glucose readings, thus each participant's standard of care blood glucose measurement will be the control. Participants will be followed from surgery check in time to the first occurring end point from: 14 days post-operation