In the FAST stroke assessment, what does the 'A' assess?

• A. Arm strength by raising both arms
• B. Ankle reflex
• C. Breathing rate
• D. Adenosine

Answer: (B)

The A in FAST checks arm weakness. In this quick check, you ask the person to extend both arms straight out in front and hold them parallel. Watch closely for any drift or unequalities—if one arm starts to sag, lowers, or cannot stay in line with the other, that suggests weakness on that side. This motor deficit is a common sign of a stroke, and spotting it fast helps prompt urgent care.

Why this fits best: the goal of the FAST screen is to identify a sudden change in brain function related to a stroke, and arm weakness is a key, observable motor change. The other ideas aren’t part of this screen: ankle reflex testing is a different neurological test, breathing rate can be affected by many conditions but isn’t used in this quick stroke check, and Adenosine is a medication, not a measure used in stroke screening. If you notice arm drift or any speech difficulties or facial drooping, call emergency services right away.