Diagnostic Evaluation for Arterial Thrombosis

Initial Assessment

The American Heart Association recommends that all patients with arterial thrombosis should undergo immediate diagnostic testing including blood glucose, complete blood count with platelet count, prothrombin time/INR, activated partial thromboplastin time, serum electrolytes, renal function tests, ECG, and cardiac ischemia markers 1, 2, 3
Complete blood count with platelet count is essential to detect thrombocytopenia or polycythemia that could influence treatment decisions 1, 2, 3
Prothrombin time/INR is critical for patients on warfarin or with liver dysfunction 1, 2, 3
Activated partial thromboplastin time is necessary to assess coagulation status and detect anticoagulant use 1, 2, 3
Blood glucose testing is necessary as hypoglycemia can mimic stroke symptoms, and hyperglycemia is associated with worse outcomes 1, 2, 3
Serum electrolytes and renal function tests are necessary to identify metabolic derangements and guide medication dosing 1, 2, 3
A 12-lead ECG is mandatory to screen for atrial fibrillation, atrial flutter, and acute myocardial infarction 1, 2, 3, 4
Cardiac ischemia markers are necessary as acute MI can cause stroke, and stroke can precipitate myocardial ischemia 1, 2, 3

CT or MRI of the brain is mandatory to distinguish ischemic stroke from hemorrhage or other structural lesions, as clinical features alone are insufficient for accurate diagnosis 4, 5

Echocardiography (with or without contrast) is recommended to evaluate for cardiac sources of embolism in cases of unexplained or cryptogenic arterial thrombosis 4
Long-term cardiac rhythm monitoring is recommended to detect paroxysmal atrial fibrillation using mobile telemetry or implantable loop recorder in cases of unexplained or cryptogenic arterial thrombosis 4
Noninvasive vascular imaging (CTA or MRA) is recommended to identify arterial dissection, vasculitis, or moyamoya disease in cases of unexplained or cryptogenic arterial thrombosis 4
The American College of Medical Genetics recommends that routine thrombophilia testing is NOT recommended for most patients with arterial thrombosis, except in specific scenarios such as young patients with arterial thrombosis lacking traditional atherosclerotic risk factors 6, 7, 8

The American Heart Association recommends that acute treatment (such as thrombolytic therapy) should not be delayed while awaiting laboratory results unless there is clinical suspicion of bleeding abnormality, thrombocytopenia, or known anticoagulant use 1, 2, 3
The diagnostic evaluation should be completed or underway within 48 hours of symptom onset 4