PRL and Infertility: There was no difference between the groups regarding age, age subgroups (20–29, 30–39, and ≥ 40 years old), BMI, smoking status, infertility period, cause of infertility, baseline FSH, LH, E2, TSH, prolactin levels, antral follicle count, stimulation day, stimulation protocol, gonadotropin dose required, maximum E2and progesterone levels, and endometrial thickness on hCG administration and transfer days (p > 0.05).