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The true BBT can only be obtained by continuous temperature monitoring through internally worn temperature sensors. In women, ovulation will trigger a rise in BBT between 0.2º and 0.5 °C. (0.5 and 1.°F) that lasts approximately until the next menstruation. This temperature shift may be used to determine the onset of post-ovulatory infertility.
Higher levels of progesterone released during the menstrual cycle causes an abrupt increase in basal body temperature by 0.5 °C to 1 °C at the time of ovulation. [7] This enables identification of the fertile window through the use of commercial thermometers. This test can also indicate if there are issues with ovulation. [8]
For avoiding pregnancy, the perfect-use failure rate of Creighton was 0.5%, which means that for each year that 1,000 couples using this method perfectly, that there are 5 unintended pregnancies. The typical-use failure rate, representing the fraction of couples using this method that actually had an unintended pregnancy, is reported as 3.2% ...
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Basal body temperature alone is most effective at preventing pregnancy if the couple abstains from intercourse from the beginning of menstruation through the third day after the basal body temperature has risen. [5] BBTs only show when ovulation has occurred; they do not predict ovulation. Sperm typically lasts for at least three days and can ...
The chart should show low temperatures before ovulation in the follicular phase, and higher ones after ovulation in the luteal phase. Using a basal thermometer in connection with a chart over several months should show the best times when conception can take place and enable the planning of intercourse or artificial insemination.
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