Endocrinological parameters in experimental unilateral undescended testis

It is a common clinical practice to estimate FSH, LH and testosterone levels in patients with unilateral undescended testis (U/L UDT) as a prognostic pointer to fertility potential. Is this practice correct? To ascertain this aspect, new born rats were operated to create experimental U/L UDT by gubernaculectomy and anchoring the gubernaculum to anterior abdominal wall. Fertility and hormone levels were evaluated later in adult life. Though fertility of rats with U/L UDT was significantly less (p < 0.01) than the controls, no significant alterations were found in the levels of serum testosterone, FSH and LH. Even though variations in the hormone levels may be responsible, to a certain extent, for the decrease in fertility potential in U/L UDT, estimation of sex hormone levels in U/L UDT is not a sensitive indicator of fertility potential. U/L UDT may additionally be affecting fertility through non-endocrinological mechanisms.