Early or late response in poor responders: does it make a difference in cycle outcome?

Ovarian response to stimulation mainly determines the length of stimulation. However, there is no clarity in the literature regarding the optimal duration required to achieve oocyte maturity in patients with the poor ovarian response (POR) defined by Bologna criteria. Therefore, a total of 267 cycles that fulfilled the inclusion criteria were selected retrospectively. Group A constitute of patients with a stimulation period < 9 d ( = 70); and group B included patients with a stimulation period ≥ 9 d ( = 133). The results showed that antral follicle count (5.72 ± 1.82 vs. 5.10 ± 1.78,  = 0.023), serum oestradiol level on hCG day (1286.88 ± 778.18 pg/mL vs. 820.14 ± 479.04 pg/mL,  = 0.001), and total gonadotropin dose used (2949.53 ± 727.92 IU vs 2020.94 ± 415.17 IU,  = 0.0001) were higher in group B when compared to group A. Although the number of total (5.47 ± 3.32 vs 3.86 ± 2.15,  = 0.0001) and mature oocytes retrieved (4.34 ± 2.88 vs 2.84 ± 1.67,  = 0.0001) were higher in group B, no significant difference was observed in the pregnancy rates between groups (25.6 vs 15.7%,  > 0.05). In conclusion, no deleterious effect of a shorter duration of stimulation on cycle outcome was seen in patients with POR.