Final answer:
The best initial test for stroke is a swift clinical assessment using the FAST mnemonic, while the most accurate test after clinical evaluation is neuroimaging through a CT scan or MRI, with the CT scan being the faster and more commonly available option in emergencies.
Step-by-step explanation:
Initial and Most Accurate Stroke Tests
When suspecting a stroke, the best initial test is a rapid clinical assessment using the FAST mnemonic; Face drooping, Arm weakness, Speech difficulties, and Time to call emergency services. This quick check can help determine if stroke symptoms are present. The most accurate test for diagnosing a stroke, after the initial assessment, is neuroimaging, particularly a CT scan or an MRI. CT scans are typically used first as they are faster and more readily available in emergency situations. A MRI can provide more detailed images and is used to identify smaller or more subtle strokes that may not be visible on a CT scan.
It is critical to identify a stroke early, as treatments like clot-busting drugs can be most effective within a narrow time window after the onset of symptoms.