Objective To determine whether serum estradiol (E2) level was low after Depot-medroxyprogesterone (DMPA) induced amenorrhea for contraception, thus to evaluate the safety of using DMPA.

• 目的确定醋酸甲孕酮（DMPA）作为避孕针使用致闭经后是否会出现雌激素水平低落，以评价DMPA的安全性。