FSHB and Infertility: The multivariate linear regression model using the enter method with variables including the woman’s age, BMI, duration of infertility, type of infertility, AMH, bFSH, ovarian stimulation protocol, serum oestradiol, LH, progesterone levels on trigger day, total dosage of Gn, duration of stimulation, and total number of retrieved oocytes showed that only the woman’s age and duration of infertility, but not ovarian stimulation protocol (p = 0.852), were associated with the euploidy rate of blastocysts in the PGT-A cycles (Table 4).