Involving the male partner for interpreting the basal body temperature graph.

Area of Science:

• Reproductive endocrinology
• Human physiology
• Fertility awareness methods

Background:

• Basal body temperature (BBT) tracking is a common fertility awareness method.
• Exogenous factors can influence BBT readings, potentially affecting accuracy.
• A need exists to identify reliable methods for controlling or accounting for these influences.

Purpose of the Study:

• To investigate whether a male partner's basal body temperature (BBT) can serve as a control for external influences on a woman's BBT.
• To assess the potential of using couple's temperature data to improve BBT method accuracy.

Main Methods:

• 12 couples participated in 41 couple-cycles, recording daily oral temperatures.
• Luteinizing hormone (LH) test kits were used to estimate ovulation timing.
• Covariability between partners' pre-ovulatory temperatures was analyzed.
• Temperature differences (gaps) between partners were compared in pre- and post-ovulatory phases.

Main Results:

• Significant covariability was observed between partners' pre-ovulatory temperatures (covariance parameter = 0.49; P <.001).
• Pre- and post-ovulatory temperature gaps differed significantly between partners (P <.001).
• The mean post-ovulatory temperature gap was consistently larger (≥0.3°F) than the mean pre-ovulatory gap.

Conclusions:

• Incorporating the male partner's BBT recording can potentially enhance the interpretation and accuracy of the BBT fertility method.
• A distinct increase in the couple's temperature gap signifies the transition from the pre- to post-ovulatory phase.
• Couples can establish their unique temperature gap threshold to identify this fertile transition.