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In women, ovulation causes a sustained increase of at least 0.2 °C (0.4 °F) in BBT. Monitoring BBTs is one way of estimating the day of ovulation. The tendency of a woman to have lower temperatures before ovulation, and higher temperatures afterwards, is known as a biphasic temperature pattern.
There is some evidence that for couples who have been trying to conceive a child for less than 12 months, and the female is under 40 years old, practicing timed intercourse (timing intercourse with ovulation using urine tests that predict ovulation) may help improve the rate of pregnancy and live births. [39]
Just a slight increase in basal body temperature indicates one is ovulating. “A rise of 0.5 degrees Fahrenheit can detect when you are going to ovulate,” she says.
In the 1930s, Reverend Wilhelm Hillebrand, a Catholic priest in Germany, developed a system for avoiding pregnancy based on basal body temperature. [12] This temperature method was found to be more effective at helping women avoid pregnancy than were calendar-based methods. Over the next few decades, both systems became widely used among ...
Ovulation occurs ~35 hours after the beginning of the LH surge or ~10 hours following the LH surge. Several days after ovulation, the increasing amount of estrogen produced by the corpus luteum may cause one or two days of fertile cervical mucus, lower basal body temperatures, or both. This is known as a "secondary estrogen surge".
In a reference group representing all women, the 95% prediction interval of the LMP-to-ovulation is 8.2 to 20.5 days. [30] The average time to birth has been estimated to be 268 days (38 weeks and two days) from ovulation, with a standard deviation of 10 days or coefficient of variation of 3.7%. [32]
In women who have regular menstrual cycles, the fertile window occurs at approximately the same time every month. If the first day of menses is considered day 1, then ovulation occurs around day 14. In regular cycles that are 26–32 days long, the fertile window occurs on days 8–19. [9]
An individual's body temperature typically changes by about 0.5 °C (0.9 °F) between its highest and lowest points each day. [15] Body temperature is sensitive to many hormones, so women have a temperature rhythm that varies with the menstrual cycle, called a circamensal rhythm. [11] [unreliable medical source?
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