Basal Body Temperature Charting (BBT)

BBT charts can predict the time of ovulation and if there is any problem with ovulation. The average body temperature increases slightly at a higher level of progesterone.

The interpretation of the BBT chart is essential in diagnosing female infertility. A significant increase in temperature after ovulation is an indication that ovulation has occurred.

In women, BBT may rise by 0.3 – 0.6°C (0.5 – 1.0°F) during ovulation. By keeping track of their BBT every day, women can potentially determine if and when they ovulate.

Throughout a typical menstrual cycle, BBT fluctuates as follows:-

- The follicular phase occurs before ovulation, when estrogen levels are high and progesterone levels are low. BBT ranges from 36.4 – 36.8°C (97 – 98°F).

- One day prior to ovulation, there is a surge in luteinizing hormone, and BBT reaches its lowest point, also known as the nadir.

- After ovulation, progesterone levels increase up to 10 times their previous level. BBT increases by 0.3 – 0.6°C (0.5 – 1.0°F) -

and typically remains above 37°C for the next 10-14 days. This is called the luteal phase of the cycle.

- If fertilization does not occur, progesterone levels and BBT both decrease 1-2 days before menstruation starts.

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