Which finding on a blood smear is most characteristic of intravascular hemolysis?

Which finding on a blood smear is most characteristic of intravascular hemolysis?

• A. Schistocytes
• B. Spherocytes
• C. Target cells
• D. Acanthocytes

Answer: (A)

Intravascular hemolysis causes red blood cells to be destroyed inside the circulation, often from mechanical shear or microangiopathic damage. The most characteristic finding on a blood smear is schistocytes—fragmented, helmet-shaped red blood cells that result when membranes are torn as cells squeeze through damaged or constricted vessels. This fragmentation pattern directly reflects intravascular destruction. Spherocytes, by contrast, are dense red cells with reduced or absent central pallor due to membrane loss from extravascular hemolysis or membrane disorders. Target cells appear as a bullseye and are seen in liver disease, thalassemias, or hemoglobinopathies. Acanthocytes have irregular spiky projections and are associated with abetalipoproteinemia or certain liver conditions.

Intravascular hemolysis causes red blood cells to be destroyed inside the circulation, often from mechanical shear or microangiopathic damage. The most characteristic finding on a blood smear is schistocytes—fragmented, helmet-shaped red blood cells that result when membranes are torn as cells squeeze through damaged or constricted vessels. This fragmentation pattern directly reflects intravascular destruction.

Spherocytes, by contrast, are dense red cells with reduced or absent central pallor due to membrane loss from extravascular hemolysis or membrane disorders. Target cells appear as a bullseye and are seen in liver disease, thalassemias, or hemoglobinopathies. Acanthocytes have irregular spiky projections and are associated with abetalipoproteinemia or certain liver conditions.