Which test is commonly performed using a gray topped tube?

The gray topped tube is specifically designed for tests that require the measurement of glucose levels, whereby it contains potassium oxalate and sodium fluoride. These additives help in preserving glucose concentrations by inhibiting glycolysis, which is the breakdown of glucose by cells. Therefore, tests like the Oral Glucose Tolerance Test (OGTT) make use of the gray tube for such reasons.

In contrast, other tests like the Complete Blood Count, Lipid Panel, and Basic Metabolic Panel do not need the same preservation of glucose and typically utilize different types of tubes that are suitable for their respective testing requirements. The distinction is significant because each type of tube contains specific additives that either promote or inhibit certain reactions in the blood sample, thereby affecting the accuracy and reliability of the test results.