<ul id="mwBCs"><li id="mwBCw">an <a rel="mw:WikiLink" href="./Medical_ultrasonography" title="Medical ultrasonography" class="mw-redirect" id="mwBC0">... by @wikipedia

an ultrasound/doppler study of the carotid arteries (to detect carotid stenosis) or dissection of the precerebral arteries;
an electrocardiogram (ECG) and echocardiogram (to identify arrhythmias and resultant clots in the heart which may spread to the brain vessels through the bloodstream);
a Holter monitor study to identify intermittent abnormal heart rhythms;
an angiogram of the cerebral vasculature (if a bleed is thought to have originated from an aneurysm or arteriovenous malformation);
blood tests to determine if blood cholesterol is high, if there is an abnormal tendency to bleed, and if some rarer processes such as homocystinuria might be involved.