Figure 1

Study timeline and representative cervical fluid impedance and basal body temperature (BBT) curves. All subjects finished vaginal bleeding prior to starting impedance measurements. Once bleeding stopped, all participants began using (1) Kegg™ cervical fluid impedance, (2) BBT, and (3) CleraBlue® Luteinizing hormone (LH) strips until a positive LH result was obtained. Serum quantification of hormones in the blood: LH, follicle stimulating hormone, estrogen, total testosterone, and prolactin, and vaginal ultrasound was then performed within 5 days of a positive LH test. Serum quantification of progesterone occurred 5–7 days post-ovulation to confirm normal cycle progression. This scheme was repeated for three menstrual cycles