Table 1-5. CAUSES OF HUMAN INFERTILITY (~ % of cases)

MALE FACTOR (40): adrenal hyperplasia, antisperm antibodies, cryptorchidism, hypogonadotropic hypogonadism, impotence, mumps orchitis, retrograde ejaculation, thyroid dysfunction, varicocele

PELVIC FACTOR (30): endometriosis, pelvic inflammatory disease (tubal occlusion)

OVARIAN FACTOR (15): androgen excess (adrenal), gonadal dysgenesis, hypothalamic-pituitary insufficiency, hyperprolactinemia, inadequate luteal phase, polycystic ovarian disease,
luteinized unruptured follicle syndrome, premature ovarian failure, thyroid disorder
 
CERVICAL FACTOR (15): inability of sperm to penetrate thickened mucus, Mullerian duct abnormality