Billings, E. L., Brown, J. B., Billings, J. J., & Burger, H. G. (1972). Symptoms and hormonal changes accompanying ovulation. Lancet (London, England), 1(7745), 282-284. https://doi.org/10.1016/s0140-6736(72)90291-7
Billings EL, Brown JB, Billings JJ, Burger HG. Symptoms and hormonal changes accompanying ovulation. Lancet. 1972;1(7745):282-284. doi:10.1016/s0140-6736(72)90291-7
Billings, E. L., et al. "Symptoms and hormonal changes accompanying ovulation." Lancet (London, England), vol. 1, no. 7745, 1972, pp. 282-284.
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Peak Mucus Symptom Usually Fell on or Just Before Ovulation
In 1972, doctors studied 22 married women with proven fertility. They tracked mucus changes and compared them with hormone levels. Peak mucus fell on or just before ovulation in most women. Mucus changes usually started about a week before ovulation.
Key Findings
The clear, slippery peak mucus symptom showed up on the day of ovulation in 5 of 22 women. It showed up 1 day early in 9, and 2 days early in 4.
Mucus symptoms began a mean of 6.2 days before ovulation, ranging from 3 to 10 days across the 22 women.
Ovulation occurred a mean of 0.9 days after the peak mucus symptom, ranging from 3 days after to 2 days before in one woman.
Basal body temperature generally rose 1 to 2 days after ovulation, later than the mucus-based signal in this group.
Interpretation
This cohort study followed 22 married women with proven fertility. The women learned to recognize a clear, slippery mucus pattern during their cycle. Doctors used hormone tests to find the day of ovulation. The peak mucus symptom lined up closely with hormone-confirmed ovulation. The peak symptom also matched the peak of urinary estrogen, which fits how estrogen affects the cervix. The results gave early support for the Billings Ovulation Method, described a year earlier. The authors said wider use of the method would need confirmation in practice, and said such studies were already under way. The findings support larger studies of this approach.
RRM Context
This 1972 study gave early proof that mucus changes mark ovulation. Mucus charting is one of several fertility awareness based methods. Restorative reproductive medicine checks the cycle first, then picks a treatment. The Billings Ovulation Method is still used today.
Our editorial summary of this paper, not the article's abstract.
