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[Prediction of ovulation].

R Frydman, J Testart, H Fernandez

    Journal De Gynecologie, Obstetrique Et Biologie De La Reproduction
    |January 1, 1982
    PubMed
    Summary
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    Precisely predicting ovulation is key for determining the fertile window. Monitoring luteinizing hormone (LH) levels accurately pinpoints ovulation, occurring 37-39 hours after an LH surge threshold is met.

    Area of Science:

    • Reproductive endocrinology
    • Gynecology
    • Biomedical science

    Background:

    • Accurate prediction of ovulation is crucial for fertility management and determining the fertile period.
    • Existing methods for ovulation prediction can be improved for precision and reliability.

    Purpose of the Study:

    • To precisely detect the luteinizing hormone (LH) surge that triggers ovulation.
    • To establish a reliable method for determining the timing of ovulation based on LH levels.

    Main Methods:

    • Observation of 60 spontaneous menstrual cycles.
    • Measurement of serial plasma luteinizing hormone (LH) levels.
    • Defining the LH surge threshold as a 180% increase above the mean of the previous 24 hours.
    • Utilizing ultrasound and estradiol level estimations to monitor follicle maturation.

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    Main Results:

    • The LH surge was precisely detected by monitoring plasma LH levels.
    • Ovulation was consistently observed to occur between 37 and 39 hours after the LH surge threshold was crossed.
    • LH surge detection proved to be the most constant and precise criterion for predicting ovulation.

    Conclusions:

    • Monitoring plasma LH levels is a highly accurate method for predicting ovulation.
    • The established LH surge threshold provides a reliable marker for the timing of ovulation.
    • This precise prediction of ovulation aids in understanding the chronology of pre-ovulatory events.