Progesterone in the female body peaks at ovulation and when the ovarian follicle develops into the corpus luteum after ovulation, so basal body temperature change (rise) indicates the day of ovulation. Considering the lifespan of sperm and egg, knowing when ovulation day can increase pregnancy possibility (possibility of conception is high five days prior to the day of ovulation, and highest two days prior to the day of ovulation).
Other gynecological usages
- A luteal phase shorter than 12 days and a rise in body temperature of less than 0.3-0.6°C /0.54-1.08°F means inadequate luteal function.
- Luteal phase (basal body temperatures rising) lasting for more than 20 days without dropping is considered a sign of pregnancy.
- In the first three months of confirmed pregnancy, basal body temperature with a clear drop trend may be a sign of early miscarriage.
- In cases of an ovulatory DUB (dysfunctional uterine bleeding) or induced ovulation of infertile women, basal body temperature change can be used to determine whether ovulation has taken place.
- In cases of women with abnormal vaginal bleeding, it is difficult to accurately determine menstrual cycle based on menstruation. Measuring basal body temperature can provide an accurate and reliable indication of the menstrual cycle.
- If basal body temperature is too high in gynecological endocrine patients, the possibility of pelvic tuberculosis and endometriosis should be considered.