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Creighton Model FertilityCare (CrMS)

Source: creightonmodel.com

Status: planned for v0.2. This page captures design choices ahead of implementation.

The Creighton Model (CrMS) uses the same family of square stamps as Billings (red / green / white / yellow + baby), plus a textual code overlaid on each day's stamp (e.g. 8CK, 10WL). The codes are a compact alphanumeric grammar describing sensation + lubrication + color.

Visual primitives

Same palette family as Billings (see billings.md) with a few differences:

  • Peak day is marked with P (not X).
  • A frequency suffix (X1, X2, X3, AD) is shown next to or under the stamp. v0.2 will likely render this as a separate annotation slot rather than packing it into the cell SVG.

Mucus options

From data-model/.../models/cervical-fluid/creighton/v0.json — 33 options total. The grammar:

  • Lead digit: sensation/lubrication class.
    • 0 dry · 2 damp · 2W wet · 4 shiny · 6 sticky · 8 tacky · 10 stretchy.
  • Letter modifiers (any combination, alphabetical):
    • B brown · C cloudy · K clear · G gummy · L lubricative · P pasty · R red · Y yellow · D damp · S shiny · W wet.

The code is the most informative element on a Creighton chart — the color stamp alone doesn't disambiguate. So the spec must always render the code text (unlike Billings, where the stamp suffices).

Mapping strategy

Because Creighton's option set is large, the mappingRules table is verbose. We will generate it from the canonical creighton/v0.json rather than hand-write it:

import creightonModel from 'data-model/.../models/creighton/v0.json' assert { type: 'json' };

mappingRules.mucus = Object.fromEntries(
  creightonModel.components[0].options.map((opt) => [
    opt.value,
    { fill: pickStampColor(opt), code: opt.value }
  ])
);

pickStampColor(opt) infers the stamp from opt.vector:

  • lubricative ≥ 0.7 ∨ stretchability ≥ 0.7 → fertile-class → white.
  • color ≥ 0.7 → bleeding-class → red.
  • mucusVolume > 0 ∧ ¬fertile-class → BIP → yellow.
  • mucusVolume = 0 → dry → green.

Thresholds need a designer pass; ballpark values above.

Open choices

  • Frequency suffix placement. Two options: (a) extend CellInput with a frequency?: string field; (b) render it outside the SVG as a sibling label. Probably (a) for layout-agnosticness.
  • Long codes. 10WL fits at 24 px easily, but 10KL + an X1 could overflow. Probably truncate the suffix at 12 px sizes.
  • Cyclefeminin pass-through codes (2, 2W, 10) — already routed through Creighton on ingest by bridge-cyclefeminin-net/src/converters/mucus.js. No special display handling needed; they'll match creighton/v0.json directly.

Reference images

Planned, not yet committed:

  • docs/images/creighton-chart-row.png — sample multi-cycle row.
  • docs/images/creighton-codes-legend.png — legend showing each code's stamp color.
  • docs/images/creighton-frequency.png — close-up of X1 / AD annotations.

Sources