What is the primary purpose of antiglycolytic agents in blood specimens used for glucose testing?

• A. To prevent glycolysis and preserve glucose
• B. To prevent coagulation
• C. To maintain pH
• D. To stabilize lactate

Answer: (A)

Antiglycolytic agents are used to stop glycolysis in the blood after collection so the glucose level measured truly reflects the amount present at the time of draw. Red blood cells continue to metabolize glucose via glycolysis once the blood is drawn, which would make glucose values fall if nothing inhibited this process. Fluoride, a classic antiglycolytic agent, inhibits a key glycolytic enzyme and slows glycolysis, helping preserve glucose until analysis. In the fluoride-oxalate tube, oxalate acts as the anticoagulant to prevent clotting, while fluoride specifically targets glycolysis. So the primary purpose is to preserve glucose by preventing glycolysis. The other options don’t fit because preventing coagulation is handled by the anticoagulant component, maintaining pH isn’t the role of the antiglycolytic agent, and stabilizing lactate isn’t the stated primary goal.