Sodium fluoride and potassium oxalate tubes are primarily used to collect blood samples for glucose testing. These tubes contain sodium fluoride, which acts as a preservative, and potassium oxalate, which works as an anticoagulant (prevents blood from clotting). This combination is ideal for preserving the glucose levels in the blood sample, preventing degradation over time. https://www.sinymedical.com/sodium-fluoride-potassium-oxalate-tube-uses/