Mucus Quality Descriptors

Mucus quality descriptors are the standard terms that fertility awareness-based methods (FABMs) use to record how cervical mucus looks and feels.¹ Each method uses its own set of terms. The Creighton Model FertilityCare System (CrMS) defines a set of standard descriptors. These descriptors convert sensation, appearance, color, and stretch into a structured chart entry.¹

The Billings Ovulation Method has its own descriptor language, centered on the sensation at the vulva.² Sympto-thermal methods also use these terms, together with basal body temperature.

Shared terms serve a medical purpose. They allow charts to be compared. One woman's chart, read by a trained FertilityCare Practitioner, means the same as another woman's chart read by a different practitioner. Without shared terms, individual charts cannot combine into patterns across many women that support diagnosis.

Descriptors usually record two separate observations. The first is the sensation at the vulva: lubricative, smooth, dry, or none. The second is the appearance of any discharge on the tissue: its stretch, its color, and its clarity or cloudiness.

Some methods also record the amount. Together, these records show whether the observation for a given day falls in the fertile or infertile range for that cycle day.³

The descriptors feed more structured charting tools, such as the Vaginal Discharge Recording System (VDRS) in CrMS. They also feed combined measures such as the Mucus Cycle Score. A well-described observation also helps identify the Peak Symptom. The Peak Symptom is the last day of the most fertile type of mucus in a cycle.