Which tube is commonly used to obtain a quantitative result for HCG testing?

The choice of using an SST (Serum Separator Tube), commonly known as a gold or marble tube, for quantitative HCG testing is based on its design and function. The SST contains a gel that separates serum from blood cells after centrifugation, making it ideal for tests that require serum samples.

HCG, or human chorionic gonadotropin, is a hormone often measured to confirm pregnancy and monitor certain medical conditions. For quantitative results, it is critical to obtain a serum sample that can be assessed accurately in the laboratory. The SST provides a clean and stable serum sample, facilitating reliable analysis of HCG levels.

Other tubes, such as those designated for plasma or whole blood, may not provide the same level of separation or might interfere with the measurement processes for specific hormones like HCG, making the SST the preferred choice for this type of testing.