A 6-month-old infant with β-thalassemia intermedia presents with moderate hemolytic anemia and jaundice. The parents request investigation to assess the severity of hemolysis and predict the clinical course. Which investigation is most appropriate for this purpose?
A. Bone marrow biopsy
B. Reticulocyte count and peripheral blood smear morphology
C. Spleen size measurement by ultrasound
D. Serum ferritin level
Explanation
Assessment of Hemolysis Severity in Thalassemia Intermedia
Reticulocyte Count as a Marker of Hemolysis
Key Point
The reticulocyte count is the single most reliable indicator of the rate of hemolysis and bone marrow erythropoietic response. In thalassemia intermedia, a markedly elevated reticulocyte count (often 5–10% or higher) reflects severe ongoing hemolysis and compensatory erythropoiesis.
Polychromasia (immature RBCs reflecting high reticulocyte count)
These morphologic findings, combined with reticulocyte count, provide a complete picture of hemolysis and marrow response.
Comparison with Other Investigations
Table
Investigation
Role in Thalassemia
Limitation
Reticulocyte count + smear
Assesses hemolysis severity and marrow response
Direct measure of current hemolytic state
Serum ferritin
Assesses iron overload (chronic complication)
Does not reflect acute hemolysis severity
Bone marrow biopsy
Evaluates marrow cellularity and dysplasia
Invasive; not needed for routine severity assessment
Spleen ultrasound
Detects extramedullary hematopoiesis
Anatomic finding; does not quantify hemolysis
Clinical Pearl
In thalassemia intermedia, the reticulocyte count often remains elevated (3–10%) even at baseline, distinguishing it from thalassemia major (where transfusions suppress reticulocytosis) and thalassemia trait (where reticulocyte count is normal or mildly elevated).
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