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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.
This will show an increase in estrogen that is related to ovulation. [1] [2] [3] There are devices that are like wrist watches or patches affixed to sensitive areas of the skin that measure subtle body chemical changes on the surface of the skin to help to identify time of ovulation. [4] [5] Some devices also come with on-line help and support.
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 ...
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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]
The sole manufacturer is a US for-profit company, Cycle Technologies [1]. The Standard Days Method is based on the fact that there is a fertile window during a woman's menstrual cycle which begins several days before ovulation and ends a few hours after ovulation. During this time a woman can become pregnant.
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