Serum inhibin B is secreted by ovarian granulosa cells staing at:-

Serum inhibin B is secreted by ovarian granulosa cells staing at the preantral follicle stage and therefore reflects the size of the growing follicular coho . Reduced inhibin B levels are seen with aging even in normal feile women . Inhibin B alone has poor predictive value for ovarian response but improves the predictive value when added to the CCCT (chlomiphene citrate challenge test)