Salivary phosphate as an indicator of ovulation

A method for detecting ovulation by measuring the concentration of salivary phosphate was assessed. Spontaneously produced samples were obtained from 14 women aged 18-28 years everyday during midcycle and every other day during the early and late stages of the menstrual cycle. All subjects showed significant (p less than .01-.001) phosphate peaks at midcycle. There was also a correlation between the phosphate peak and the midcycle shift in basal body temperature. It is recommended that the possibility of hormonal regulation of the salivary content of phosphate be investigated.