Essential Sameness Pattern and Yellow Stamps

The Essential Sameness Pattern (ESP) is a Creighton Model charting rule for women with daily discharge. It identifies days before Peak that look the same, day after day, as infertile. Yellow Stamps are the chart stickers that record those days.¹

Some women have discharge that never fully stops. For these women, the standard green stamp rule for dry days does not apply. The ESP addresses that gap. When the discharge looks the same each day before Peak, those days count the same as dry days. The chart records them with a Yellow Stamp. The stamp shows that the day is infertile even though discharge is present.

Yellow Stamps can also record infertile days after Peak in cycles with steady discharge. Before Peak, a woman must first meet the ESP criteria. Both uses require formal instruction from a certified FertilityCare Practitioner. The ESP and Yellow Stamps make CrMS usable for women whose charts would otherwise appear fertile every day.