**Question:** Henoch Schoniein purpura is characterized by all except -

A. Coagulation abnormalities
B. Hemolytic anemia
C. Nephritis
D. Hepatitis

**Core Concept:** Henoch Schonlieh purpura is a systemic vasculitis that primarily affects small and medium-sized blood vessels. It is typically caused by infections (bacterial, viral, or parasitic) or autoimmune diseases. The condition is characterized by the triad of purpura (non-blanching skin rash), petechiae (small red spots), and systemic involvement (hemolytic anemia, arthralgia, and abdominal pain).

**Why the Correct Answer is Right:** D. Hepatitis is not a characteristic feature of Henoch Schonlieh purpura, as the disease primarily affects blood vessels and does not directly involve the liver. In contrast, coagulation abnormalities (option A), hemolytic anemia (option B), and nephritis (option C) are key features of the disease, as they result from the inflammation of blood vessels and subsequent damage to red blood cells and end organs like the kidneys.

**Why Each Wrong Option is Incorrect:**

A. Coagulation abnormalities: Henoch Schonlieh purpura is characterized by the destruction of red blood cells, causing a relative deficiency of platelets and increased risk of bleeding. Coagulation abnormalities are typically seen in hemorrhagic disorders or conditions affecting the clotting cascade, but not in Henoch Schonlieh purpura.

B. Hemolytic anemia: Hemolytic anemia is a common finding in Henoch Schonlieh purpura due to the destruction of red blood cells. This leads to a decrease in the hemoglobin levels and can cause jaundice, fatigue, and splenomegaly.

C. Nephritis: Nephritis is present in Henoch Schonlieh purpura as a result of inflammation in the kidneys due to vasculitis. This can lead to proteinuria, hematuria, and hypertension.

**Clinical Pearl:** Henoch Schonlieh purpura is a clinical diagnosis based on the characteristic triad of symptoms (purpura, petechiae, and systemic involvement). Laboratory tests like increased indirect bilirubin, decreased hemoglobin, and elevated liver enzymes may support the diagnosis, but clinical features are essential for confirming the condition.

**Correct Answer:** D. Hepatitis is a separate liver disease characterized by inflammation and damage to liver cells, resulting in elevated liver enzymes and cholestasis. It is distinct from Henoch Schonlieh purpura and does not share its clinical features or pathogenesis.