In idiopathic TTP, which laboratory parameter is typically elevated?

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Multiple Choice

In idiopathic TTP, which laboratory parameter is typically elevated?

In idiopathic TTP, the problem is microvascular platelet-rich clots that consume platelets, leading to thrombocytopenia, while the coagulation cascade itself is not broadly activated. This means standard clotting tests like PT and aPTT are typically normal, and there isn’t a consistent rise in markers of systemic coagulation. Bleeding time, on the other hand, reflects platelet number and function; with low platelets, bleeding time is prolonged. Therefore, the laboratory parameter most likely elevated is Bleeding Time. D-dimer is not typically elevated in isolated TTP since widespread fibrin formation and breakdown are not the primary process, and PT/PTT remain normal.

In idiopathic TTP, the problem is microvascular platelet-rich clots that consume platelets, leading to thrombocytopenia, while the coagulation cascade itself is not broadly activated. This means standard clotting tests like PT and aPTT are typically normal, and there isn’t a consistent rise in markers of systemic coagulation. Bleeding time, on the other hand, reflects platelet number and function; with low platelets, bleeding time is prolonged. Therefore, the laboratory parameter most likely elevated is Bleeding Time. D-dimer is not typically elevated in isolated TTP since widespread fibrin formation and breakdown are not the primary process, and PT/PTT remain normal.

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