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Medical Definition of Platelet aggregation test
1. A test of the ability of platelets to adhere to each other and hence form a haemostatic plug to prevent bleeding; failure to aggregate occurs in several conditions, e.g., thrombasthenia, Von Willebrand's disease, and following administration of aspirin, phenylbutazone, and indomethacin; the test is conducted by quantitating the decrease in turbidity that occurs in platelet-rich plasma following the in vitro addition of one or several platelet-aggregating agents (e.g., ADP, epinephrine, or serotonin). (05 Mar 2000)