Objective: Emotional Intelligence (EI) is described as the ability to perceive, express,
understand, motivate, control and regulate emotion. The USM Emotional Quotient Inventory (USMEQ-i) was designed to measure EI and it was found to be a reliable and valid tool in a sample of prospective medical students. The objective of this study is to determine stability of the USMEQ-i to measure EI at different time and occasions. Methods: A prospective cohort study was done on 196 first year medical students. It was administered to the medical students at four different intervals. The Cronbach’s alpha and intra-class correlation analysis were applied to measure the internal consistency and agreement level across the intervals. The analysis was done using Statistical Package for Social Sciences (SPSS) version 18. Results: A total of 196 first year medical students participated in this study. Its overall Cronbach’s alpha value across intervals ranged between 0.94 and 0.97. The Cronbach’s alpha values of emotional control, emotional maturity, emotional conscientiousness, emotional awareness, emotional commitment, emotional fortitude, and emotional expression scale ranged between 0.59 and 0.91. The Cronbach’s alpha value for the faking index scale ranged from 0.76 to 0.89. The ICC coefficient values for EI total score was 0.83, EI domain score ranged between 0.62 and 0.76 and the faking index score was 0.76. Conclusion: The USMEQ-i has demonstrated a good level of stability and internal consistency to measure EI at different time and occasions. It is a promising psychometric instrument that can be used to measure EI.