Which condition leads to abnormal platelet aggregation tests?

In afibrinogenemia, there is a complete absence of fibrinogen, which is a critical component for normal platelet aggregation and clot formation. Platelets require fibrinogen to bind to one another, enabling the formation of a stable platelet plug during the hemostatic process. When fibrinogen levels are insufficient or absent, platelet aggregation tests will show significantly abnormal results because the platelets cannot effectively clump together in response to aggregating agents.

This condition directly impacts the ability of platelets to function normally during coagulation processes, which is crucial for preventing excessive bleeding. As a result, the test results will indicate low or nonexistent aggregation, highlighting the impairment in the coagulation cascade associated with this deficiency. Understanding the role of fibrinogen in platelet aggregation underscores why afibrinogenemia leads to abnormal results in aggregation tests.