What microscopic finding indicates rouleaux formation in a sample?

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Multiple Choice

What microscopic finding indicates rouleaux formation in a sample?

Rouleaux formation is seen as coin-like stacks of red blood cells on a smear. This occurs when plasma proteins, especially fibrinogen and immunoglobulins, rise and dampen the repulsive charge between RBCs, allowing them to adhere and stack in columns. That coin-stacking appearance is the classic microscopic sign of rouleaux. It’s typically associated with conditions that raise plasma proteins, such as inflammation or plasma cell disorders, rather than with tests for antibodies on cells (positive DAT) or simply with an increased reticulocyte count. Hypergammaglobulinemia contributes to the protein-protein environment, but the defining microscopic clue is the organized stack of cells seen in the smear.

Rouleaux formation is seen as coin-like stacks of red blood cells on a smear. This occurs when plasma proteins, especially fibrinogen and immunoglobulins, rise and dampen the repulsive charge between RBCs, allowing them to adhere and stack in columns. That coin-stacking appearance is the classic microscopic sign of rouleaux. It’s typically associated with conditions that raise plasma proteins, such as inflammation or plasma cell disorders, rather than with tests for antibodies on cells (positive DAT) or simply with an increased reticulocyte count. Hypergammaglobulinemia contributes to the protein-protein environment, but the defining microscopic clue is the organized stack of cells seen in the smear.

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