Menstrual blood loss (MBL), serum ferritin and cyanomethemoglobin were measured at pre-and 1,3,6,12,18,24th post-insertion periods in sixty women wearing the Steel Ring,Vcu200 or Tcu220c.

• 本文用随机的方法对60名健康妇女放置不锈钢单环、Vcu 200和Tcu 220c 3种节育器,并在放器前、后进行月经血量、血红蛋白浓度和血清铁蛋白测定。