Cyclic changes in salivary activity of N-acetyl-beta-d-glucosaminidase; a possible efficient indicator for predicting...

Salivary activity of N-acetyl-beta-D-glucosaminidase showed a characteristic pattern of changes during the normal menstrual cycle with a distinct peak on Day 13, 14, or 15 before the next menstruation. This peak of enzyme activity occurred withing one day of the nadir of basal body temperature and was absent in women with spontaneous or iatrogenic anovulatory cycles. These results are stongly suggestive that the salivary determination of this activity may be convenient indicatior for determining the day of ovulation.