Does Progesterone Affect Basal Body Temperature After IVF? - Obstetrics and Gynecology

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Progesterone, a hormone produced by the corpus luteum after ovulation, plays a significant role in regulating basal body temperature (BBT). Typically, after ovulation, progesterone levels rise, leading to an increase in BBT, which is often used as an indicator of ovulation and luteal phase health. However, the relationship between progesterone supplementation and BBT can be complex, especially in the context of assisted reproductive technologies (ART) such as in vitro fertilization (IVF).

In your case, you mentioned starting progesterone supplementation on August 25, following ovulation on August 22. It's important to note that while progesterone is expected to raise BBT, individual responses can vary. The fluctuations in your BBT readings, such as the drop you observed on August 25 and subsequent days, could be influenced by several factors, including:
1. Timing of Measurements: BBT should ideally be measured at the same time each morning after at least three hours of uninterrupted sleep. Variations in sleep patterns or the timing of measurements can lead to inaccurate readings.

2. Hormonal Fluctuations: The body’s hormonal environment can fluctuate due to various reasons, including stress, illness, or changes in routine. These fluctuations can affect BBT readings.

3. Progesterone Supplementation: While progesterone is intended to stabilize the uterine lining and support early pregnancy, it can also influence BBT. Some women may experience less pronounced temperature increases or fluctuations in BBT due to the timing and dosage of progesterone.

4. Pregnancy Status: It is possible to have a successful pregnancy even if BBT does not consistently rise above a certain threshold. Conversely, a drop in BBT does not definitively indicate that pregnancy has not occurred.
In your situation, the BBT readings you provided show fluctuations that could suggest hormonal instability or other factors at play. It is crucial to remember that BBT is just one indicator and should not be used in isolation to determine pregnancy status.
If you are concerned about the effectiveness of the progesterone supplementation or the possibility of pregnancy, it is advisable to consult your healthcare provider. They may recommend a blood test to measure hCG levels, which can provide a more definitive answer regarding pregnancy status. Additionally, they can assess whether your progesterone dosage is appropriate and if any adjustments are necessary.

In summary, while progesterone typically raises BBT after ovulation, individual responses can vary, and fluctuations in BBT do not necessarily indicate pregnancy status. Monitoring BBT can be a helpful tool, but it should be used in conjunction with other methods and under the guidance of a healthcare professional to assess reproductive health accurately.