- Basal FSH level in boys with unilateral cryptorchidism during prepuberty and bilateral cryptorchidism at mid-puberty and full puberty: higher than normal reference range.  - Basal LH in boys with bilateral cryptorchidism: higher than normal reference range.  - Post LHRH test, FSH level in cryptorchid boys: higher than normal reference range.  - Post LHRH test, LH level: higher than normal range in boys with unilateral cryptorchidism at prepuberty and at mid-puberty. This evidence concerns the gene GNRH1 and cryptorchidism.