Which coagulation disorder is characterized by a deficiency of antithrombin, leading to an increased risk of venous thromboembolism?

A Protein C deficiency
B Protein S deficiency
C Antithrombin deficiency ✓
D Factor V Leiden mutation

Explanation

Antithrombin deficiency is a rare coagulation disorder that increases the risk of venous thromboembolism due to the lack of antithrombin, a natural anticoagulant that inhibits thrombin and other coagulation factors.

Source

Williams Hematology
Hematology Hematology: Coagulation Disorders Hematology: Coagulation Disorders Hard MEDICAL Confidence: high