Basal body temperature (BBT) is defined as the lowest natural, non-pathologic body temperature recorded after a period of rest. Women have used charting average basal body temperatures over the length of a menstrual period has been a tool to determine if ovulation has occurred or not. Basal body temperature measurements have been used for decades to help women optimize the timing of intercourse during a fertile window. This unique methodology was also prevalent before the invent of oral contraception pills, as it aided women in an attempt to avoid fertilization during a fertile period. Still to this day, women use this seemingly simple tool for planning purposes.
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