Sterile blood collection tubes for laboratory procedures requiring plasma or whole blood chemistry procedures where glycolytic inhibition of specimen is required. The anti-glycolytic properties prevent the blood cells from using the glucose in the sample. Used instead of red top when there will be a delay in getting blood to the lab for a glucose level. Oxalate and EDTA are anticoagulants which will prevents the blood from clotting, sodium fluoride is a stabilizer.