Which test is associated with fibrinogen in assessing coagulation?

• A. Prothrombin Time
• B. D-Dimer test
• C. Platelet function assay
• D. Bleeding time

Answer: (B)

Fibrinogen is converted to fibrin by thrombin to form a clot, and later that fibrin is broken down into degradation products. The D-dimer test directly reflects this process by detecting these fibrin degradation products, so it specifically indicates that clot formation and subsequent breakdown involving fibrinogen-derived fibrin have occurred. That makes it the test most closely associated with fibrinogen activity in assessing coagulation.

In contrast, prothrombin time measures the time to clot formation via the extrinsic/common pathway and isn’t specific to fibrinogen status. Platelet function assays and bleeding time focus on platelet function and vascular integrity rather than fibrinogen conversion to fibrin.