Which two additives are commonly found together in the gray top tube?

Study for the Hematology 1 Test. Utilize flashcards and multiple-choice questions with detailed explanations. Prepare effectively for success!

Gray-top tubes are designed for glucose testing, requiring both inhibition of glycolysis and prevention of clotting. Sodium fluoride acts as a glycolysis inhibitor, stopping the breakdown of glucose in the sample after collection. Potassium oxalate serves as an anticoagulant by binding calcium, keeping the blood from clotting. Together, these additives preserve an accurate glucose level and maintain a usable specimen for analysis.

Other additive pairings aren’t standard for this tube. For example, EDTA is used in purple-top tubes for preserving cells in complete blood counts, not for glycolysis inhibition. The combination of fluoride with other anticoagulants or inhibitors isn’t the routine gray-top formulation, so the typical pairing you’ll see in gray-top tubes is sodium fluoride with potassium oxalate.