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  • Title: A possible method for the detection of ovulation and the determination of the duration of the fertile period.
    Author: Baker TS, Jennison K, Kellie AE.
    Journal: J Steroid Biochem; 1980 Jan; 12():411-5. PubMed ID: 7421226.
    Abstract:
    In attempt to find a more reliable and earlier predictor of ovulation, radioimmunoassay methods were investigated which could measure the levels of steroid glucuronides (follicular estrogens), varying levels of which would warn of approaching ovulation well before (up to 96 hours) its occurrence so that abstinence can be practiced during the period of sperm viability before the egg is released. To this end, daily urine collections were made on 9 subjects and the steroid glucuronides were totalled. In addition, the excretion of 5 beta-pregnanediol-3 alpha-glucuronide was measured throughout the menstrual cycle. Measurement of this parameter seemed of more practical value since the ratio of estrone-3-glucuronide/pregnanediol-3 alpha-glucuronide rises during the periovulatory period and falls sharply after the formation of the corpus lutuem. This parameter, unlike measurement of total steroid glucuronides, is not dependent on the rate of excretion or on concentration. In all 9 subjects, a significant increase in this ratio (P .05) was detected 48-120 hours before the plasma lutropin maximum. For assay, this ratio value is easier to assess because the assay kit would be applicable to early morning urine samples and would not involve any measurement of urine volume or time. A short discussion follows the experimental presentation.
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