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How To Check Your Fertility Using A Basal Thermometer
One of the simplest, and most widely used methods to check your ovulation is the using a basal body temperature (BBT) chart. The basal body temperature is one’s temperature upon waking up.
First thing in the morning before getting up or doing anything else, the woman records her temperature on a daily chart. A special BBT thermometer with an expanded, easy-to-read scale is available at most pharmacies or fertility clinics.
If you have been keeping a BBT chart at home, be sure to bring it with you to the doctor’s office on your initial visit.
In a normal twenty-eight-day cycle, from day one of the cycle (the first day of menstruation) through days twelve to fourteen, a woman’s BBT is usually between 97.2 and 97.6 degrees Fahrenheit (between 36.2 and 36.4 degrees centigrade).
From just after ovulation, at midcycle, through to the onset of the next period, the BBT rises as much as one degree.
This temperature change results from fluctuations in hormone levels. Estrogen, predominant before ovulation, tends to lower body temperature. Progesterone, produced after ovulation by the corpus luteum (the structure left after the follicle releases the egg), tends to raise body temperature.
So the temperature early in the menstrual cycle will be low, and when the woman ovulates and progesterone is released, the temperature will rise.
The BBT chart should reflect this rise in temperature: the curve on the chart normally is low in the early part of the cycle, rises at, or right after, ovulation, and remains high until the woman’s next cycle.
The rise in temperature at ovulation can happen suddenly in one day or slowly over several days. If a woman’s temperature stays elevated for sixteen days or more, she may be pregnant, since the corpus luteum usually stops producing progesterone after thirteen to fifteen days.
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