What combination makes up the PT test reagent?

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Multiple Choice

What combination makes up the PT test reagent?

The PT test reagent must provide tissue factor to initiate the extrinsic coagulation pathway, a phospholipid surface for coagulation factors to assemble on, and calcium to reverse the citrate in plasma and start clotting. That’s why the reagent is composed of thromboplastin (tissue factor) with phospholipid and calcium chloride. Without tissue factor, the extrinsic pathway isn’t triggered; without calcium, clotting can’t proceed in citrated plasma; without phospholipid, the coag factors can’t assemble properly on a surface. The other options miss one of these essential components.

The PT test reagent must provide tissue factor to initiate the extrinsic coagulation pathway, a phospholipid surface for coagulation factors to assemble on, and calcium to reverse the citrate in plasma and start clotting. That’s why the reagent is composed of thromboplastin (tissue factor) with phospholipid and calcium chloride. Without tissue factor, the extrinsic pathway isn’t triggered; without calcium, clotting can’t proceed in citrated plasma; without phospholipid, the coag factors can’t assemble properly on a surface. The other options miss one of these essential components.

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