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Inverting anticoagulant tubes serves the critical function of mixing the blood with the anticoagulant agent contained in the tube. When blood is collected into an anticoagulant tube, it is essential to ensure proper interaction between the blood and the anticoagulant to effectively prevent coagulation. By inverting the tube several times after blood collection, you facilitate an even distribution of the anticoagulant throughout the blood sample, which helps to maintain the sample in a liquid state for accurate testing and analysis.

While preventing coagulation is a vital aspect of the function of anticoagulant tubes, the action of inverting directly contributes to this by ensuring that the anticoagulant works properly, making mixing the contents an equally important and more direct purpose of the inversion process. Therefore, the correct choice illustrates the significance of this mixing action rather than simply stating the outcome of preventing coagulation.