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Basal body temperature (BBT or BTP) is the lowest body temperature attained during rest (usually during sleep). It is usually estimated by a temperature measurement immediately after awakening and before any physical activity has been undertaken. This will lead to a somewhat higher value than the true BBT.
Progesterone plays a vital role in making the endometrium receptive to implantation of the embryo and supportive of early pregnancy. High levels of progesterone inhibit the follicular growth. The increase in estrogen and progesterone also lead to increased basal body temperature during the luteal phase. [3]
Basal body temperature is the lowest temperature attained by the body during rest (usually during sleep). It is generally measured immediately after awakening and before any physical activity has been undertaken, although the temperature measured at that time is somewhat higher than the true basal body temperature.
"[Implantation] usually occurs about 5 days after fertilization," explains Dr. Langdon, but of course, every body is different. On average, implantation occurs about 8-10 days after ovulation, but ...
The action of progesterone increases basal body temperature by one-quarter to one-half degree Celsius (one-half to one degree Fahrenheit). The corpus luteum continues this paracrine action for the remainder of the menstrual cycle, maintaining the endometrium, before disintegrating into scar tissue during menses. [20]
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 ...
Pregnancy is the time during which one or more offspring ... increased basal body temperature sustained for over two weeks ... implantation of the embryo outside ...
Days from estimated ovulation by basal body temperature record + 14 days: ±4 days First-trimester physical examination: ±2 weeks Second-trimester physical examination: ±4 weeks Third-trimester physical examination: ±6 weeks First-trimester obstetric ultrasonography (crown-rump length) ±8% of the estimate