A 30-year-old woman with a history of systemic lupus erythematosus presented to the emergency department with a 24-hour history of headache and altered mental status. Her medical history included ...

THE coumarin anticoagulants depress the synthesis of four clotting factors: prothrombin; proconvertin (factor VII); Stuart factor (factor X); and plasma thromboplastin component, or PTC (factor IX).

Activated Partial Thromboplastin Time (aPTT or APTT): is a medical test that characterizes blood coagulation. Partial thromboplastin time (PTT) measures the overall speed at which blood clots by means ...

THE increasing enthusiasm for treating thromboembolic diseases with prothrombin-reducing drugs for long periods in ambulatory patients has emphasized the lack of clear definition of the therapeutic ...