The primary objective of this study is to evaluate the performance and safety of the intravenous blood glucose (IVBG) System relative to point of care (POC) meter performance when each method is compared to the Yellow Springs Instrument (YSI) under various conditions in the operating room (OR), ICU and general ward (GW) in subjects undergoing elective or non-emergent surgery as well as subjects admitted to the medical/surgical ICU. POC meter systems are currently used in the hospital environment to measure blood glucose values. The YSI is an accepted reference standard for assessing POC meter accuracy.