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Objective: Understanding ejection fraction (EF) limits are crucial for the evaluation of diastolic function (DF). Therefore, in our study, we aimed to compare the DFs between patients with low-normal and high-normal EFs. Methods: A total of 70 patients who were followed in our clinic were prospectively included in our study. Those with an EF of 55-62% were included in the low-normal EF group, and those with an EF >62% were included in the high-normal EF group. Subsequently, the relationship between DF and EF was analyzed. Results: Both groups exhibited similarities in demographic characteristics, such as age, sex, and additional medical conditions, demonstrating homogeneous distribution among the groups. No statistically significant difference was observed between the groups in terms of diastolic and systolic parameters. Conclusion: No relationship was found between normal EF and DF. Nonetheless, our work can serve as a model for more extensive research on this topic. [ABSTRACT FROM AUTHOR]