Implications of cycle length immediately after discontinuation of combined oral contraceptives on use of the Standard Days Method

International Journal of Gynaecology and Obstetrics : the Official Organ of the International Federation of Gynaecology and Obstetrics
Marcos ArévaloLuis Bahamondes

Abstract

To determine when after discontinuing the use of combined oral contraceptives (COC) women can start using the Standard Days Method (SDM)-a fertility awareness-based family-planning method that is appropriate only for women for whom most menstrual cycles last 26-32 days. 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. In total, 47.2% of the 2845 women included in the study had a first post-COC cycle of 26-32 days; 40.5% had a second cycle within that range. A first post-COC cycle within the 26-32-day range did not predict a second cycle within range. Women discontinuing COC should not start using the SDM in their first or second post-COC cycle, even if the first cycle falls within the stated range. Instead, they should use a backup method until they meet the necessary eligibility criteria.

References

Jan 1, 1977·International Journal of Gynaecology and Obstetrics : the Official Organ of the International Federation of Gynaecology and Obstetrics·R N TaylorA E Treloar
Jan 1, 1969·Acta Obstetricia Et Gynecologica Scandinavica·U Larsson-Cohn
Feb 16, 2000·Obstetrics and Gynecology·P J SulakT J Kuehl
Oct 16, 2004·Fertility and Sterility·Marcos ArévaloIrit Sinai
Apr 13, 2005·Gynecological Endocrinology : the Official Journal of the International Society of Gynecological Endocrinology·Ingrid DuijkersChristine Klipping
Apr 4, 2007·American Journal of Obstetrics and Gynecology·Carolyn L WesthoffDebra Kalmuss
Jan 15, 2008·Animal Reproduction Science·R A Bowen

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