Hemolytic anemia may be characterized by all of the following except-
**Core Concept**
Hemolytic anemia is characterized by the premature destruction of red blood cells, leading to anemia. This condition can result from various causes, including autoimmune disorders, infections, and genetic abnormalities.
**Why the Correct Answer is Right**
The correct answer is a feature of hemolytic anemia. In this condition, the premature destruction of red blood cells leads to an increase in indirect bilirubin, which is a breakdown product of hemoglobin. This increase in indirect bilirubin can cause jaundice, a common symptom of hemolytic anemia. The mechanism involves the breakdown of red blood cells, which releases hemoglobin, and the subsequent conversion of hemoglobin to bilirubin.
**Why Each Wrong Option is Incorrect**
* **Option A:** Increased indirect bilirubin is a characteristic of hemolytic anemia, not a feature that is absent.
* **Option B:** Decreased haptoglobin is a feature of hemolytic anemia, as haptoglobin binds to free hemoglobin in the blood. In hemolytic anemia, haptoglobin levels decrease as it binds to the increased amount of free hemoglobin.
* **Option C:** Elevated reticulocyte count is a feature of hemolytic anemia, as the bone marrow produces more red blood cells to compensate for the increased destruction of red blood cells.
**Clinical Pearl / High-Yield Fact**
A key feature of hemolytic anemia is the presence of schistocytes (fragmented red blood cells) on the peripheral blood smear, which is a result of mechanical damage to red blood cells.
**Correct Answer:** D