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  • Title: Early urinary pregnancy testing. Correlation with serum beta-HCG radioimmunoassay.
    Author: Corson SL, Batzer FR.
    Journal: J Reprod Med; 1982 Dec; 27(12):725-8. PubMed ID: 7161752.
    Abstract:
    Urinary pregnancy testing with Sensitex, a tube macroflocculation system, produced a positive test by 17 days after basal-body-temperature-timed ovulation in 59% of determinations. Data from days 18 to 21 showed that a negative test was associated with a statistically significantly increased propensity for first-trimester abortion. Freezing of the urinary specimens, but not refrigerated sm, produced a positive test by 17 days after basal-body-temperature-timed ovulation in 59% of determinations. Data from days 18 to 21 showed that a negative test was associated with a statistically significantly increased propensity for first-trimester abortion. Freezing of the urinary specimens, but not refrigerated storage for five days, adversely affected the accuracy of the test.
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