Point of Change (POC)

By RRM Academy Reviewed by Dr. Naomi Whittaker, MD, Board-Certified OBGYN, MIGS, NFPMC, FCI Updated May 7, 2026

The Point of Change (POC) is the day a CrMS chart first departs from the established Base Infertile Pattern, marking the start of fertile-phase mucus and the corresponding rise in estradiol.⁷⁸

For women charting with a Base Infertile Pattern, the POC is the functional equivalent of the first day of mucus observation in a standard cycle. Hilgers correlated the POC with rising estradiol-17β and the beginning of the follicular phase. Any observation that differs from the established BIP, even subtly, qualifies as the POC and signals that the fertile window has opened.

The POC is practically important for postpartum women, those transitioning off suppressive medications, breastfeeding mothers, and perimenopausal women whose cycles do not follow a predictable pattern. Correctly identifying the POC requires a well-established BIP documented over prior consecutive days. Instruction through a certified FertilityCare Practitioner is necessary for accurate application in these populations.

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.