blood follicle stimulating hormone amount EFO:0004768 The proportion, quantity, or volume in whole blood, serum, or plasma of 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. Trait.ontology VT:0002790 blood follicle stimulating hormone level circulating follicle stimulating hormone level serum levels of FSH serum levels of follicle stimulating hormone serum levels of follitropin serum levels of gametokinetic hormone blood gonadotropin amount blood pituitary hormone amount