A fluoride tube, often called a gray-top tube, is a type of blood collection tube used in clinical laboratories, primarily for glucose and lactate testing. It contains sodium fluoride and potassium oxalate as additives. Sodium fluoride inhibits glycolysis, preventing glucose breakdown, while potassium oxalate acts as an anticoagulant, preventing blood clotting. This ensures accurate glucose measurements, especially when there is a delay
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