The difference between glass and plastic red stopper tubes is that the:

Question

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Plastic tubes contain a clot activator, which helps in facilitating the clotting process, while glass tubes contain heparin, an anticoagulant that prevents blood from clotting. The choice of tube depends on the test being performed; however, since the question specifically mentions red stopper tubes, which are used for serum or plasma separation, plastic tubes with clot activators are the best choice.

The Difference Between Glass and Plastic Red Stopper Tubes Is