Which color tube is used for glucose testing?

The gray top tube is the appropriate choice for glucose testing. This tube contains additives that are specifically designed to inhibit glycolysis, which is the breakdown of glucose by cells. When blood is drawn and placed in a gray top tube, these additives help to preserve glucose levels, ensuring that the test results accurately reflect the patient's blood glucose concentration at the time of the draw.

In addition, the gray top tube typically contains sodium fluoride and potassium oxalate, which further aid in stabilizing glucose levels and preventing any test interference. This makes it the best option when testing for glucose levels compared to the other colored tubes, which are designed for different tests and purposes.