Moreover, the interior of the tubes may be coated with various substances. For example, some are lined with anticoagulants like heparin, which prevents the blood from clotting and is suitable for tests that require whole blood, such as blood gas analysis. Others contain clot activators that speed up the clotting process, facilitating the separation of serum for biochemical assays. The tubes are also color – coded, with each color representing a specific additive or intended use, allowing for easy identification and proper handling in a busy laboratory environment.
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