{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,26]],"date-time":"2025-10-26T14:21:27Z","timestamp":1761488487977},"reference-count":20,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2016,12,2]],"date-time":"2016-12-02T00:00:00Z","timestamp":1480636800000},"content-version":"vor","delay-in-days":2254,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Intl J Gynecology &amp; Obste"],"published-print":{"date-parts":[[2010,10]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objective<\/jats:title><jats:p>To determine when after discontinuing the use of combined oral contraceptives (COC) women can start using the Standard Days Method (SDM)\u2014a fertility awareness\u2010based family\u2010planning method that is appropriate only for women for whom most menstrual cycles last 26\u201332 days.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>We reviewed data from the medical records of women who attended the Human Reproduction Unit at the University of Campinas, Brazil, between October 16, 1979, and May 5, 2006. The study population comprised women younger than 40 years of age who had recently switched from COC to copper intrauterine devices and whose clinical records contained the information necessary for determining the length of the first menstrual cycle immediately after discontinuing COC.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>In total, 47.2% of the 2845 women included in the study had a first post\u2010COC cycle of 26\u201332 days; 40.5% had a second cycle within that range.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>A first post\u2010COC cycle within the 26\u201332\u2010day range did not predict a second cycle within range. Women discontinuing COC should not start using the SDM in their first or second post\u2010COC cycle, even if the first cycle falls within the stated range. 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