From your 2021 MCME Online module on stroke:
The Los Angeles Motor Scale (LAMS) classifies patients based on the severity of their stroke symptoms. Scores ≥ 4 can help predict a Large Vessel Occlusion (LVO) stroke. Optimal care for LVO strokes can only be completed at select specialized stroke centers, within a certain time window. Therefore, identification of these strokes in the prehospital environment, using the LAMS Score, can help get the patient the best possible treatment.