Why are collection tubes color-coded?

Collection tubes are color-coded primarily to denote the type of additive present in the tube. Each color represents specific additives that are used to preserve or enhance the sample for analysis. For example, a red-top tube usually contains no additives and is used for serum collection, while a green-top tube may contain heparin as an anticoagulant to prevent blood clotting. This color-coding system helps healthcare professionals quickly identify the correct tube needed for specific tests, ensuring samples are processed appropriately for accurate results.

Using the correct tube with the appropriate additive is crucial because the choice of additive can affect the chemistry of the sample and subsequently influence the diagnostic outcomes. This practice simplifies the selection process and minimizes errors in specimen collection and handling.