For diagnosing ischemic (blockage) stroke in the emergency setting:<ul id="mwA-E"><li id="mwA-I">CT scans (<i id="mwA-M">without</i> contrast enhancements) <ul id="mwA-Q"><li id="mwA-U"><a rel="mw:WikiLink" href="./Sensitivity_(tests)" title="Sensitivity (tests)" class="mw-redirect" id="mwA-Y">sensitivity</a>= 16% (less than 10% within first 3 hours of symptom onset)</li> <li id="mwA-c"><a rel="mw:WikiLink" href="./Specificity_(tests)" title="Specificity (tests)" class="mw-redirect" id="mwA-g">specificity</a>= 96%</li></ul></li> <li id="mwA-k">MRI scan <ul id="mwA-o"><li id="mwA-s">sensitivity= 83%</li> <li id="mwA-w">specificity= 98%</li></ul></li></ul>
