Abstract

Basal body temperature (BBT) charts for menstrual cycles of 98 women were evaluated by six experienced physicians. The time of ovulation as estimated from the charts by a consensus of at least five of the evaluators coincided with the luteinizing hormone (LH) peak +/- 1 day in only 17 (22.1%) of the 77 cycles that were determined by endocrine profiles to be ovulatory and to have adequate luteal phases. An additional 22.1% of these cycles were thought to have monophasic patterns by a consensus of the physicians. Extreme caution in interpretation is urged when BBT is used for clinical or research evaluations of ovulation or menstrual cycle dynamics.

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