AbstractObjective: Degree of correlation between Emergency Department admission and hospital discharge diagnosis. Design: A prospective study in a six month period at Accident and Emergency Department of Peerless Hospital and B.K. Roy Research Centre, Kolkata, which had four in- patient specialties- Medicine, Surgery, Paediatrics and Orthopaedics.Subjects: All cases admitted through the emergency department in the study period. Main outcome measures:degree of correlation between emergency department admission diagnosis and hospital discharge diagnosis. Results: of all admission diagnosis, 75.77% was accurate or partially accurate to the final discharge diagnosis.The accuracy of diagnosis was statistically better in traumatic cases, male sex, and younger adults.Conclusion: history talking and physical examination remained the most important diagnostic tools in the emergency department. Simple investigations available at the emergency department were not helpful in improving diagnostic accuracy.