**Question:** A patient with microcytic hypochromic anemia, Hb- 9%, serum iron is 20 ?/dl, ferritin level 800 ng/ml, transferrin percentage saturation is 64. What is possible diagnosis?

A. Iron deficiency anemia
B. Hemochromatosis
C. Sideroblastic anemia
D. Thalassemia

**Correct Answer:** D. Thalassemia

**Core Concept:** Microcytic hypochromic anemia refers to a type of anemia characterized by small and pale red blood cells. In this case, we are examining the patient's iron status markers:

1. Serum iron: 20 ?/dl - This is low, indicating reduced iron availability for hemoglobin synthesis.
2. Ferritin level: 800 ng/ml - This is high, suggesting excessive iron storage rather than deficiency.
3. Transferrin percentage saturation: 64% - This is normal, indicating adequate iron utilization for hemoglobin synthesis.

**Why the Correct Answer is Right:** Given the low serum iron and high ferritin levels, the diagnosis of iron deficiency anemia is less likely. Instead, we focus on the patient's clinical presentation and laboratory findings that point towards a hereditary disorder affecting hemoglobin synthesis.

**Why Each Wrong Option is Incorrect:**

A. Iron deficiency anemia: The serum iron is low, but the ferritin level is normal, making this diagnosis less likely.
B. Hemochromatosis: The ferritin level is high, making this diagnosis unlikely.
C. Sideroblastic anemia: The ferritin level is high, making this diagnosis less likely.
D. Thalassemia: The combination of low serum iron and high ferritin levels, along with normal transferrin saturation, is consistent with thalassemia.

**Clinical Pearl:** Thalassemia is a group of inherited disorders characterized by abnormal hemoglobin synthesis, leading to microcytic hypochromic anemia. The high ferritin level in this case indicates increased iron storage, which is a common feature of thalassemia. Clinical pearls related to thalassemia include:

1. Thalassemia minor: heterozygous carriers of thalassemia may present with mild anemia and increased iron storage.
2. Chloroquine therapy: This is used for prophylaxis and treatment of malaria, but can exacerbate thalassemia by causing hemolysis and worsening anemia in affected patients.
3. Transfusion therapy: Regular transfusions are often required in severe thalassemia to maintain hemoglobin levels and prevent complications like organ enlargement and cardiovascular failure.