<prompt> For glucose estimation in blood, the mode of transport from a PHC to lab:Sodium fluorideEDTACitrate0.9 saline  <response>: Ans. A. Sodium fluorideIn glycolysis, i.e. the pathway in which, glucose is utilized to form energy, Enolase is an enzyme which converts 2- phosphoglycerate to a high energy compound phosphoenolpyruvate.a. This enzyme requires MgMn is inhibited by fluoride.b. For blood glucose estimation, fluoride is added to the blood to prevent glycolysis by cells, so that the blood glucose is correctly estimated. 