1,5-Anhydroglucitol (1,5-AG) is the 1-deoxy form of D-glucose. Its level in blood plasma has been used in clinical research to investigate short-term glycemic control levels in diabetic patients. Cereals and animal source proteins constitute the main 1,5-AG source for humans.Most of 1,5-AG is absorbed by renal tubules, and its levels in human body are highly regulated and relatively consistent. Glucose can act as a competitive inhibitor of 1,5-AG in blood. Therefore, glucose levels are inversely proportional to 1,5-AG concentrations. The physiological function of 1,5-AG is not well understood. Recent studies showed 1,5-AG uptake could be associated with sodium-dependent glucose transporter. 1,5-Anhydroglucitol Uptake Assay Kit utilizes a proprietary fluorescent 1,5-AG analog, which can be taken up by cells. However, this 1,5-AG analog cannot be fully utilized in glycolytic processes and thus accumulates inside the cells. Fluorescence generated by this analog is proportional to the cellular 1,5-AG uptake. The assay can be used to monitor 1,5-AG uptake by using fluorescent microscopy and flow cytometry. Phloretin, a compound that can inhibit glucose transporter and 1,5-AG cell uptake, is included in the kit as a control. This non-radioactive assay kit is easy-to-use and allows qualitative and quantitative measurements of 1,5-AG uptake in cultured cells.