Blood Glucose Collection Tube EDTA K2 Sodium Fluoride Gray Top Product Overview Blood Glucose Collection Tube is a gray-top blood collection tube containing EDTA K2 and sodium fluoride for blood glucose sample collection and laboratory analysis. EDTA K2 chelates calcium ions to prevent blood coagulation, while sodium fluoride helps inhibit glucose breakdown and supports the stability of the collected sample during handling and testing. The tube is commonly used for blood