Which of the following is normal in a patient regularly taking aspirin?

a. Bleeding time
b. Platelet cyclooxygenase function
c. Synthesis of thromboxane A2
d. Platelet count


ANS: D
Only the platelet count, of those evaluations listed, is normal in a patient who regularly takes aspirin. Aspirin acetylates cyclooxygenase, which is necessary for the synthesis of thromboxane A2. This prolongs the bleeding time.

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