Preoperative cessation timing for acetylsalicylic acid therapy prior to elective surgery is typically two weeks. Which option reflects this timing?

• A. 1 week
• B. 2 weeks
• C. 3 weeks
• D. 4 weeks

Answer: (B)

The timing rests on how long aspirin keeps platelets from functioning. Acetylsalicylic acid irreversibly inhibits COX-1 in platelets, halting thromboxane A2 production and platelet aggregation. Since platelets lack nuclei, they can’t repair this effect; new platelets must be produced for normal function. Platelets live about 7 to 10 days, so stopping aspirin allows the circulating platelets to be replaced. By around two weeks, most platelets in circulation have turned over, and platelet function returns toward normal, reducing the risk of excessive bleeding during elective surgery. Shorter intervals may leave some platelets still inhibited and bleed more, while much longer intervals unnecessarily increase thrombotic risk by removing antiplatelet protection. Hence, two weeks is a practical, common cessation window for elective procedures.