Aim: To investigate the relationship between markers of ovarian reserve, associated endocrinopathies and increased ovarian response in patients undergoing gonadotrophin stimulation during in vitro fertilization procedures. Methods: A retrospective analysis of medical records from infertile female patients with preserved or high ovarian reserve and 10 or more oocytes retrieved in a single IVF cycle was done. Analysed data included ovarian reserve markers and associated endocrinopathies. Results: The mean age of participants was 35.5 years (±4.58), with 62% treated after the age of 35. AMH values showed broad distribution in oocyte number, with OHSS identified in 3 participants in the middle AMH category. No clear age-related trend in AMH concentration was observed. PCOS prevalence was low (3%) among the study group, while autoimmune thyroiditis (22%) and hyperprolactinemia (9%) were more common. Endocrinopathies were most frequent in the middle AMH category. Conclusion: This research indicates that a significant proportion of stimulated IVF patients with preserved/high ovarian reserve are of older reproductive age. A negative correlation between age and the number of oocytes retrieved was observed. Concentrations of AMH varied significantly, suggesting they are not strictly age dependent. Autoimmune thyroiditis was the most common endocrinopathy, while PCOS was rare. These results highlight the complexity of factors influencing IVF outcomes and indicate the need for further research.