What is the main use of the Gray Tube Top?

The Gray Tube Top is primarily used for glucose testing due to its specific additive, which stabilizes glucose levels in the blood sample for accurate measurement. This tube typically contains sodium fluoride, which inhibits glycolysis, thereby preventing the breakdown of glucose by metabolic processes within the red blood cells. By preserving the glucose concentration, it allows for reliable testing.

While other uses, such as trace element analysis, may involve other types of tubes, the Gray Top is particularly notable for its role in glucose monitoring, especially in diabetes management and other metabolic studies. This makes it crucial for obtaining specimens intended for laboratory analysis of glucose levels, distinguishing it from tubes used for other tests like coagulation or immunology.