Table 1. Stroke Performance Measures and Measure Definitions from the Masschusetts EMS Stroke Quality Improvement Project, 2009–2012.

Measure Name	Measure Definition
Stroke screening performed	Percentage of patients with a clinical impression of stroke, possible stroke, or TIA who have a Cincinnati stroke screen documented.
Blood glucose tested	Percentage of patients with a clinical impression of stroke, possible stroke, or TIA who have blood glucose level documented by capillary blood glucose measurement.
Time-last-known-well documented	Percentage of patients with a clinical impression of stroke, possible stroke, or TIA who have a documented time at which the patient was last known to be without the signs and symptoms of the current stroke or at his or her prior baseline.
Time of symptom discovery documented	Percentage of patients with a clinical impression of stroke, possible stroke, or TIA who have a time of symptom discovery documented.
Stroke prenotification to hospital	Percentage of patients with a clinical impression of stroke, possible stroke, or TIA for whom stroke specific prenotification was called to the receiving emergency department and documented.

Abbreviation: EMS, emergency medical services; TIA, transient ischemic attack.