A patient presents with a history of recurrent arterial thrombosis, and laboratory tests reveal elevated levels of antiphospholipid antibodies. What is the most likely diagnosis?

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

Explanation

The presence of antiphospholipid antibodies is a hallmark of antiphospholipid syndrome, which is characterized by recurrent arterial or venous thrombosis and/or pregnancy morbidity.

Source

Clinical guidelines and research articles on antiphospholipid syndrome
Hematology Hematology: Coagulation Disorders Hematology: Coagulation Disorders Hard MEDICAL Confidence: high