PLOD1 and Infertility: There were significant differences between the two groups in terms of age, basal follicle-stimulating hormone, basal LH, basal estradiol, anti-Müllerian hormone, body mass index (BMI), types of infertility, causes of infertility, numbers of retrieved oocytes, fertilization mode, estradiol, LH and progesterone levels before progesterone administration, number of embryos transferred cycles and development days of blastocysts.