increased circulating follicle stimulating hormone level higher than normal levels in the blood stream of FSH, the hormone that, in females, stimulates the graafian follicles of the ovary and assists in follicular maturation and the secretion of estradiol; in the male it stimulates the epithelium of the seminiferous tubules and is partly responsible for spermatogenesis increased serum levels of FSH increased serum levels of follitropin MPheno.ontology MP:0001750 increased serum levels of gametokinetic hormone increased serum levels of follicle stimulating hormone increased circulating gonadotropin level increased circulating pituitary hormone level increased follicle stimulating hormone level