Chantler E N, Lo K, Elstein M
Br J Obstet Gynaecol. 1977 Sep;84(9):705-7. doi: 10.1111/j.1471-0528.1977.tb12685.x.
Carbonic anhydrase activity is present in human cervical mucus throughout the normal menstrual cycle. Lowest activity occurs in the ovulatory phase. A similar pattern of activity is seen in the presence of either an 'inert' or copper-releasing intrauterine contraceptive device (IUCD). The overall levels of activity are not significantly altered by the presence of either type of IUCD. A cyclic pattern of activity is retained even though endogenous ovarian function is suppressed by combined oestrogen-progestogen oral contraceptives.
在整个正常月经周期中，人宫颈黏液中都存在碳酸酐酶活性。排卵期活性最低。在放置“惰性”或含铜宫内节育器（IUCD）的情况下，也可见到类似的活性模式。两种类型的IUCD的存在均未显著改变活性的总体水平。即使联合使用雌激素 - 孕激素口服避孕药抑制了内源性卵巢功能，活性的周期性模式仍得以保留。
