What is the function of the SST additive found in the gold or tiger top tube?

The SST additive, commonly found in gold or tiger top tubes, serves a dual purpose. It promotes the clotting of blood and facilitates the separation of serum after centrifugation. The gel at the bottom of the tube acts as a barrier that separates the serum from the blood cells once the sample has been processed. This is particularly important for obtaining serum samples used for various laboratory tests, as it ensures that the serum is free from cellular components, allowing for more accurate testing results.

In contrast, the other options do not accurately describe the function of the SST additive. For instance, options that suggest preventing coagulation or enhancing bacterial growth do not apply, as the primary role of the SST additive is to facilitate clotting, not inhibit it or promote bacterial proliferation. Stabilizing glucose levels is also not a function of this specific additive; instead, that requires different types of additives designed specifically for preserving glucose in blood samples.