The prevalence of AMH below the normal range was greater in patients with bilateral cryptorchidism than in boys with unilateral cryptorchidism between 6 months and 1.9 years (Fisher’s exact test, P = 0.006) and in boys between 2 and 8.9 years (Fisher’s exact test, P = 0.043). This evidence concerns the gene AMH and cryptorchidism.