An intensive care patient develops sepsis. His blood pressure drops to 60/15 mm Hg and he stas to bleed from venipuncture sites. Disseminated intravascular coagulation is suspected. Which of the following sets of stat laboratory values would confirm the likely diagnosis?
**Core Concept**
Disseminated intravascular coagulation (DIC) is a complex condition characterized by the simultaneous activation of the coagulation and fibrinolytic pathways, leading to the formation of microthrombi and consumption of clotting factors. This results in a paradoxical state of both thrombosis and bleeding.
**Why the Correct Answer is Right**
In DIC, the activation of the coagulation cascade results in the consumption of clotting factors and platelets, while the fibrinolytic pathway is simultaneously activated, leading to the degradation of fibrin clots. This results in a decrease in the levels of fibrinogen, factor V, factor VIII, and platelets, while the fibrin degradation products (FDPs) and D-dimer levels increase. Therefore, laboratory values confirming DIC would include low fibrinogen, low platelet count, low factors V and VIII, high FDPs, and high D-dimer levels.
**Why Each Wrong Option is Incorrect**
**Option A:** This option does not specify any of the characteristic laboratory values of DIC. It is incomplete and does not provide a clear diagnosis.
**Option B:** This option only mentions a low platelet count, which is a possible finding in DIC, but does not account for the other characteristic laboratory values required to confirm the diagnosis.
**Option C:** This option mentions a high D-dimer level, which is a possible finding in DIC, but does not account for the other characteristic laboratory values required to confirm the diagnosis.
**Clinical Pearl / High-Yield Fact**
In patients with suspected DIC, it is essential to obtain a comprehensive coagulation profile, including fibrinogen, platelet count, factors V and VIII, FDPs, and D-dimer levels. Early recognition and management of DIC can improve outcomes in critically ill patients.
**Correct Answer: D.**