Aspirin irreversibly suppresses platelet function for how many days?

Aspirin irreversibly suppresses platelet function for how many days?

• A. 1-2 Days
• B. 3-5 Days
• C. 7-10 Days
• D. 14-21 Days

Answer: (C)

Aspirin irreversibly inhibits platelet function by acetylating COX-1, which blocks thromboxane A2 production and prevents aggregation. Because platelets lack nuclei, they can’t synthesize new COX-1 to restore function, so the antiplatelet effect lasts for the life of the platelet. Platelets circulate for about 7–10 days, so the ability to aggregate remains suppressed for roughly that period until new platelets are produced. This is why the expected duration is about 7 to 10 days, not just a few days. If timing around procedures matters, this lifespan explains the need for withheld dosing about a week beforehand.

Aspirin irreversibly inhibits platelet function by acetylating COX-1, which blocks thromboxane A2 production and prevents aggregation. Because platelets lack nuclei, they can’t synthesize new COX-1 to restore function, so the antiplatelet effect lasts for the life of the platelet. Platelets circulate for about 7–10 days, so the ability to aggregate remains suppressed for roughly that period until new platelets are produced. This is why the expected duration is about 7 to 10 days, not just a few days. If timing around procedures matters, this lifespan explains the need for withheld dosing about a week beforehand.