Clotting factors that is not affected in liver disease is?
**Core Concept**
Liver disease can affect the coagulation cascade by impairing the synthesis of various clotting factors. The liver produces most of the clotting factors, including prothrombin (factor II), fibrinogen (factor I), and factors V, VII, IX, and X. However, some clotting factors are produced in the lungs or other tissues, and their production is not directly affected by liver disease.
**Why the Correct Answer is Right**
The correct answer is **Factor VIII**. Factor VIII is a clotting factor that is produced in the endothelial cells of blood vessels, particularly in the lungs. In liver disease, the production of clotting factors such as prothrombin, fibrinogen, and factors V, VII, IX, and X is impaired due to decreased synthesis in the liver. However, the production of Factor VIII remains unaffected, resulting in a relative excess of this clotting factor.
**Why Each Wrong Option is Incorrect**
* **Option A:** Factor II is a clotting factor that is produced in the liver and is decreased in liver disease. It plays a crucial role in the coagulation cascade and its deficiency can lead to bleeding.
* **Option B:** Factor V is a clotting factor that is also produced in the liver and is decreased in liver disease. It is a critical component of the coagulation cascade and its deficiency can lead to bleeding.
* **Option C:** Factor X is a clotting factor that is produced in the liver and is decreased in liver disease. It plays a key role in the coagulation cascade and its deficiency can lead to bleeding.
**Clinical Pearl / High-Yield Fact**
In liver disease, the decreased synthesis of clotting factors can lead to a bleeding diathesis. However, the relative excess of Factor VIII can paradoxically increase the risk of thrombosis.
**Correct Answer:** D. Factor VIII.