https://en.gongdong.com/products/glucose-tube/ Grey Top Tube for Glucose Golden VacTM glucose in tube is used for blood glucose, glucose tolerance, red blood cell electrophoresis, sugar hemoglobin, etc. The Glucose Tube is Plasma Blood Collection Tube. Description of Glucose Blood Sugar Test Tube 01 Obtain highly stable plasma for blood glucose testing. 02 Sodium Fluoride is an inhibitor of glucose degradation.