In situ variation of cervical mucus pH during exposure to atmospheric air

Cintia Helena Morel Correa, Ana Luiza Gelpi Mattos, Annarita Ferrari
In: Brazilian Journal of Medical and Biological Research · 2001 · vol. 34(6) , pp. 767–770 · doi:10.1590/s0100-879x2001000600011 · PMID:11378666 · W2078524844
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⚙ AI-generated summary by claude@2026-06, 2026-06-07 ⓘ

This study found that exposing cervical mucus to air for 5 to 10 minutes significantly increased its pH, potentially affecting sperm-mucus interaction and necessitating immediate post-collection testing.

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⚙ AI-generated deep summary by claude@2026-06, 2026-06-07 ⓘ

This short clinical investigation evaluated whether exposing cervical mucus to atmospheric air during specular examination alters cervical mucus pH in 20 reproductive-age women with good-quality periovulatory mucus and no detected cervical/vaginal pathology or relevant drug use. Using an in situ glass microelectrode, the authors measured ecto- and endocervical pH immediately (0 min) and after 5 and 10 minutes of air exposure, finding a progressive alkalinization at both ectocervical and endocervical sites, with significant differences between 0 vs 5 min and 0 vs 10 min but not between 5 vs 10 min. They conclude that 5–10 minutes of air exposure can significantly affect pH and that sperm–mucus interaction testing (e.g., postcoital-type assessments) may be misinterpreted if performed after delays, noting no other explicit limitations beyond their selective inclusion criteria. This paper does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via a keyword match in the upstream search index.

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Abstract

The objective of the present study was to determine if exposure of cervical mucus to air during specular examination could modify mucus pH. Detection of changes is justified because of their possible interference with sperm-mucus interaction, since an acidic pH is unfavorable to sperm penetration and is associated with infertility due to the cervical factor. Twenty women with good quality mucus were evaluated. pH measurements of ecto- and endocervical mucus were made in situ using a glass electrode after 0-, 5- and 10-min exposure to air. There was a progressive alkalinization of mucus pH. Mean values of ectocervical mucus pH were 6.91, 7.16 and 7.27, while mean values of endocervical mucus pH were 7.09, 7.34 and 7.46 at 0, 5 and 10 min, respectively. Significant differences were found between the mean values obtained at 0 and 5 min, and at 0 and 10 min (P<0.05), whereas the differences in mean values at 5 and 10 min were not significant at either site. We conclude that 5 to 10 min of exposure to atmospheric air affects cervical mucus pH in a significant way. Since tests used to evaluate sperm-mucus interaction generally have not considered this possibility, we suggest that they should be performed immediately after mucus collection in order to avoid misinterpretation of the results.

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infertility

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last seen: 2026-06-10T17:14:06.276822+00:00
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