MRCP2-2501

A 32-year-old man with a history of minimal change glomerulonephritis presents at the Emergency Department with a swollen left lower leg. His medication includes ramipril 10 mg daily and furosemide. He recently returned from a flight from France. On examination, he has an obvious left DVT and his BP is 140/80 mmHg. Based on the given investigations, what is the most probable cause of his thrombosis?