What is a primary laboratory manifestation of antiplatelet therapy?

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Multiple Choice

What is a primary laboratory manifestation of antiplatelet therapy?

Explanation:
The main concept is that antiplatelet therapy mainly affects primary hemostasis by impairing platelet function. This shows up in the lab as reduced or impaired platelet aggregation when platelets are challenged with agonists, while the coagulation cascade tests stay normal. So the hallmark is impaired platelet aggregation with normal coagulation tests. Prolonged PT or aPTT would point to problems in the coagulation factors, not platelet function, and a low fibrinogen level reflects a separate issue with fibrin formation rather than platelet activity.

The main concept is that antiplatelet therapy mainly affects primary hemostasis by impairing platelet function. This shows up in the lab as reduced or impaired platelet aggregation when platelets are challenged with agonists, while the coagulation cascade tests stay normal. So the hallmark is impaired platelet aggregation with normal coagulation tests. Prolonged PT or aPTT would point to problems in the coagulation factors, not platelet function, and a low fibrinogen level reflects a separate issue with fibrin formation rather than platelet activity.

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