The purpose of this study was to determine the variability in length of the fertile phase of the menstrual cycle with 140 participants who produced 1,060 cycles with an electronic hormonal fertility monitor. The length of the fertile phase, as defined by the first day with a threshold level of urinary E3G and ending with a second day above a threshold of LH, varied from <1 to >7 days, with the most frequent length being 3 days.
PMID 18249381 18249381 DOI 10.1016/j.fertnstert.2007.10.050 10.1016/j.fertnstert.2007.10.050
Cite this article
Fehring, R. J., & Schneider, M. (2008). Variability in the hormonally estimated fertile phase of the menstrual cycle. *Fertility and sterility*, *90*(4), 1232-1235. https://doi.org/10.1016/j.fertnstert.2007.10.050
Fehring RJ, Schneider M. Variability in the hormonally estimated fertile phase of the menstrual cycle. Fertil Steril. 2008;90(4):1232-1235. doi:10.1016/j.fertnstert.2007.10.050
Fehring, R. J., and M. Schneider. "Variability in the hormonally estimated fertile phase of the menstrual cycle." *Fertility and sterility*, vol. 90, no. 4, 2008, pp. 1232-1235.
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Infertility > Assisted Reproductive Technology > IVF OutcomesPregnancy > Neonatal Outcomes > Birth Weight and Gestational AgeContraception/Comparison > ART vs Natural Conception > Sibling Studies
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