Sympto-Thermal Method (STM)

By RRM Academy Reviewed by Dr. Naomi Whittaker, MD, Board-Certified OBGYN, MIGS, NFPMC, FCI Updated April 18, 2026

A cycle charting method combining multiple biomarkers (primarily cervical mucus changes and basal body temperature (BBT) shifts) to identify the fertile window. BBT rises approximately 0.2 to 0.5 degrees C following ovulation due to progesterone secretion from the corpus luteum. STM identifies the pre-ovulatory and post-ovulatory infertile phases using both markers.

This content is for educational purposes only and does not constitute medical advice. Consult an RRM clinician or healthcare provider for guidance specific to your situation.