Measurement of pH in the lower female genital tract during the periovulatory period: comparison of electrometric and colorimetric procedures.

In 53 patients with regular ovulatory cycles, the pH in the lateral vaginal fornix, at the external uterine orifice and in the cervical canal was measured daily in the periovulatory period. The values of pH measured by the colorimetric and the electrometric methods did not show any statistically significant difference. The relationship between pH values of cervical mucus and the estradiol peak is discussed.