The following set of findings is seen in Disseminated Intravasular Coagulation (DIC):
**Core Concept**
Disseminated Intravascular Coagulation (DIC) is a complex disorder characterized by the systemic activation of coagulation pathways, leading to the formation of microthrombi in small blood vessels. This process consumes platelets and clotting factors, resulting in a paradoxical state of both hypercoagulability and hemorrhage.
**Why the Correct Answer is Right**
The correct answer reflects the hallmark laboratory findings in DIC. Increased Fibrin Degradation Products (FDPs) indicate the breakdown of cross-linked fibrin clots, which are formed in response to the widespread activation of coagulation. Prolonged Prothrombin Time (PT) and activated Partial Thromboplastin Time (aPTT) reflect the consumption of clotting factors and platelets, respectively. Reduced platelet count is a direct consequence of platelet consumption in the formation of microthrombi.
*Increased FDP, decreased PT, and increased antithrombin III* are not typical findings in DIC. Antithrombin III levels may actually be decreased in DIC due to consumption.
*Increased FDP, decreased PT, and increased thrombin-antithrombin III complexes* are also incorrect. Decreased PT is not characteristic of DIC.
*Increased FDP, prolonged PT, and increased thrombin-antithrombin complexes* is incorrect because decreased thrombin-antithrombin III complexes would be expected in DIC due to consumption of antithrombin III.
**Clinical Pearl / High-Yield Fact**
In DIC, the consumption of clotting factors and platelets leads to a paradoxical state of both hypercoagulability and bleeding tendency. The diagnosis is often challenging and requires a combination of clinical, laboratory, and imaging findings.
**✓ Correct Answer: D. Increased FDP, prolonged PT, reduced Platelets**