Sudden Temperature Shift Rule - the Sympto-thermal Method of Fertility Awareness

This person experienced a sudden temperature shift. On cycle day 16, their basal body temperature was 98.1 ºF (36.75 ºC), which is 0.4 ºF (0.2 ºC) higher than any of the previous six days. Since their BBT on this day is at least 0.2 ºF (0.1 ºC) above any of the previous six days, they can assume cycle day 16 is the day of their temperature shift. On cycle day 18, after three consecutive days of a basal body temperature that is above the coverline, the Temperature Shift Rule is satisfied.Learn the rules of the sympto-thermal method of fertility awareness.

This person experienced a sudden temperature shift. On cycle day 16, their basal body temperature was 98.1 ºF (36.75 ºC), which is 0.4 ºF (0.2 ºC) higher than any of the previous six days. Since their BBT on this day is at least 0.2 ºF (0.1 ºC) above any of the previous six days, they can assume cycle day 16 is the day of their temperature shift. On cycle day 18, after three consecutive days of a basal body temperature that is above the coverline, the Temperature Shift Rule is satisfied.

Learn the rules of the sympto-thermal method of fertility awareness.