Which of the following coagulation disorders is characterized by a deficiency of protein S?

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

Explanation

Protein S is a vitamin K-dependent protein that plays a crucial role in the regulation of coagulation. A deficiency of protein S can lead to an increased risk of thrombosis.

Source

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