Pituitary and gonadal function in the infant son of a patient with hypogonadotropic hypogonadism.

We have evaluated the pituitary-gonadal function of the infant son of a patient with hypogonadotropic hypogonadism. The father was treated with hCG and FSH to induce fertility. The son had normal external genitalia and his testicular volume increased appropriately during early infancy. Basal and post GnRH gonadotropin levels, as well as testosterone concentrations increased during early infancy. The data suggest that this infant had adequate gonadotropin secretion and testicular function. The patient illustrates the potential usefulness of evaluating the pituitary-gonadal function of male infants suspected of having hypogonadotropic hypogonadism.