What color tube is typically used for serum tests?

The gold tube is typically used for serum tests because it contains a gel separator that allows for the separation of serum from the blood cells after centrifugation. This makes it ideal for tests that require serum, as it provides a clear, undiluted sample for analysis. The gel forms a barrier that helps to protect the serum from contamination by cells and other components of the blood after it has been spun down, ensuring accurate test results.

In contrast, the other colors mentioned do not serve the same purpose for serum collection. The gray tube is used for glucose testing and may contain additives that preserve glucose levels, while the lavender tube is generally reserved for hematology tests that require whole blood or plasma. The light blue tube is specifically for coagulation studies and contains sodium citrate, which is an anticoagulant and prevents the blood from clotting, making it unsuitable for serum tests.