What is the mode of action for the additive ACD?

The correct answer pertains to the role of ACD, or Acid-Citrate-Dextrose, as an additive used in blood collection tubes. ACD works primarily by inactivating complement proteins, which are involved in the body's immune response and can activate pathways that lead to clotting. By inactivating these proteins, ACD prevents clot formation, allowing for the effective storage and analysis of blood specimens without interference from the body's natural coagulation processes.

This complement inactivation is particularly important in laboratory settings where accurate analysis of blood components is required, as it helps maintain the integrity of the sample during transportation and storage. This action is crucial for various tests that rely on the absence of clotting factors, ensuring that the sample retains its original properties for accurate diagnostic results.