Oral epithelial alkaline phosphatase in various phases of menstrual cycle.

We report here on the changes in the Alkaline Phosphatase staining reaction in oral mucosa of women in various phases of menstrual cycle. It appears that the highest reaction for alkaline phosphatase is shown just after ovulation (about 15th-16th day of cycle). It is possible to judge the period of ovulation by taking daily smears and staining them for Alkaline phosphatase.