Which test of the coagulation system requires a blood tube containing diatomaceous earth?

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Activated clotting time (ACT) requires a blood tube containing diatomaceous earth. The tube is coated with diatomaceous earth to activate the coagulation pathway and allows for rapid measurement of clotting time. This test is commonly used during cardiac surgeries and can detect deficiencies in factors II, V, and X, as well as the presence of circulating anticoagulants. Bleeding time and whole blood clotting time require different collection methods, and one-stage prothrombin time requires a different type of anticoagulant in the collection tube.

Which Test of the Coagulation System Requires a Blood Tube