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Variability in the Hormonally Estimated Fertile Phase of the Menstrual Cycle
Fertility and Sterility
  • Richard Fehring, Marquette University
  • Mary Schneider, Marquette University
Document Type
Format of Original
3 p.
Publication Date
Original Item ID
doi: 10.1016/j.fertnstert.2007.10.050

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 from7 days, with the most frequent length being 3 days.


Accepted version. Fertility and Sterility, Vol. 90, No. 4 (October 2008): 1232-1235. DOI. © 2008 Elsevier. Used with permission.

NOTICE: this is the author’s version of a work that was accepted for publication in Fertility and Sterility. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Fertility and Sterility, VOL 90, ISSUE 4, (October 2008) DOI.

Citation Information
Richard Fehring and Mary Schneider. "Variability in the Hormonally Estimated Fertile Phase of the Menstrual Cycle" Fertility and Sterility (2008) ISSN: 0015-0282
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