Efficacy of cervical mucus observations plus electronic hormonal fertility monitoring as a method of natural family planning

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Abstract

Objective: To determine the effectiveness of an electronic hormonal fertility monitor plus cervical mucus monitoring to avoid pregnancy. Design: A 12-month prospective clinical efficacy trial. Setting and Partcipants: One hundred ninety five (195) women (mean age 29.8 years) seeking to avoid pregnancy with a natural method at 5 clinical sites in 4 cities. Intervention: Each participant was taught to track fertility by self-observation of cervical mucus and an electronic monitor that measures urinary levels of estrone-3-glucuronide and luteinizing hormone. Main Outcome Measures: Correct- and typical-use unintended pregnancy rates. Results: There were a total of 26 unintended pregnancies, 3 with correct use. With 1,795 months of use, the correct-use pregnancy rate was 2.1% per 12 months of use (i.e., 97.9% effective in avoiding pregnancy when rules of the method were always followed) and the imperfect-use pregnancy rate was 14.2% per 12 months of use (i.e., 85.8% effective in avoiding pregnancy when rules of the method were not always followed and all unintended pregnancies and months of use were included in the calculations). Conclusion: Correct use of an electronic hormonal fertility monitor with cervical mucus observations can be as effective as other fertility awareness-based methods of natural family planning. Comparative studies are needed to confirm this conclusion. © 2007, AWHONN, the Association of Women's Health, Obstetric and Neonatal Nurses.

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Fehring, R. J., Schneider, M., Raviele, K., & Barron, M. L. (2007). Efficacy of cervical mucus observations plus electronic hormonal fertility monitoring as a method of natural family planning. JOGNN - Journal of Obstetric, Gynecologic, and Neonatal Nursing, 36(2), 152–160. https://doi.org/10.1111/j.1552-6909.2007.000129.x

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