Objective: To evaluate correlation of Alberta Stroke Program Early CT Score (ASPECTS) and early and delay outcome measures among acute anterior ischemic stroke patients who presented within 48 hours of stroke onset. Methods: In a prospective cohort study, we recruited consecutive patients with acute middle cerebral artery (MCA) ischemic stroke who presented within 48 hours of stroke onset. All the patients were evaluated at admission (Glasgow Coma Scale - GCS and National Institute of Health Stroke Scale - NIHSS) at discharge (GCS, NIHSS, Barthel Index - BI and modifi ed Rankin Scale - mRS) and at 3 months (BI and mRS). CT ASPECTS was calculated by two observers independently. We divided patients in to two groups with ‘Better’ and ‘Worse’ ASPECTS with score of 8-10 and 0-7 respectively and compared the primary and secondary stroke outcome measures. Results: Among 100 patients with acute MCA infarction (median age 55 yrs, 62 males), median ASPECTS scores had inter-rater reliability of 0.82. The mortality, GCS and NIHSS at discharge, and mRS and BI at 3 months are signifi cantly better among patients with ‘Better’ compared to ‘Worse’ APSECTS. The hospital stay was shorter in patients with Better ASPCTS. Conclusion: In the setting of acute ischemic stroke, ASPECTS has good correlation with severity of stroke, and is strong predictor of early and delayed outcome in acute ischemic stroke.