A patient has a splitting headache prior to his blood draw.He takes two aspirin,and his blood is drawn.Platelet aggregation studies are performed,and one comes back abnormal.Based on this information,which agonist will show a normal aggregation pattern?
A)Arachidonic acid
B)Epinephrine
C)Collagen
D)Ristocetin

Question

Quizplus · Accepted Answer

Ristocetin-induced platelet aggregation is independent of the cyclooxygenase pathway, which aspirin inhibits. Therefore, it will show a normal aggregation pattern despite aspirin intake.

A Patient Has a Splitting Headache Prior to His Blood