Creighton Model FertilityCare System (CrMS)
The Creighton Model FertilityCare System (CrMS) is a standardized, prospective method of natural family planning based on daily systematic observation and classification of cervical mucus at the vulva. Developed by Dr. Thomas Hilgers at the Pope Paul VI Institute, CrMS uses a precise notation system for mucus characteristics including color, consistency, and sensation. It is used by couples to achieve or avoid pregnancy and, in conjunction with NaProTECHNOLOGY, to identify cycle-phase abnormalities that guide targeted medical and surgical treatment. The CEIBA prospective cohort study, conducted across 17 CrMS centers in the USA and Canada, reported a 13-cycle pregnancy rate of 89.6% among couples using correct CrMS technique and timing intercourse to peak-type mucus days.1 CrMS is distinct from other fertility awareness-based methods: its developers classify it specifically as an NFP method, and its standardized notation forms the diagnostic data layer that NaProTECHNOLOGY relies on for cycle-timed blood tests and interventions. The Peak Day reference point established in CrMS charting is central to NaPro's hormone evaluation protocols.
Cited in this entry
- Pregnancies, intentions, and fertility behaviors during use of the Creighton Model FertilityCare System. https://pmc.ncbi.nlm.nih.gov/articles/PMC12306780/
Discussed in
Research library
- Impact of instruction in the Creighton model fertilitycare system on time to pregnancy in couples of proven fecundity: results of a randomised trial
- Pregnancies, intentions, and fertility behaviors during use of the Creighton Model FertilityCare System after initial intention to avoid pregnancy: Results from the Creighton Model effectiveness, intentions, behaviors assessment study
- Chapter 18: Professional and Academic Infrastructure of the CrMS
- Chapter 12: Decision Making in the CrMS
- Pregnancy probabilities during use of the Creighton Model Fertility Care System
Patient questions
- What is NaProTECHNOLOGY and the Creighton Model (CrMS)?
- Which labs, imaging, and cycle tracking does RRM use?
- Do I need to be Catholic to use Creighton/NaPro or see an RRM clinician?
- How does RRM diagnose and treat luteal phase deficiency?
- What is the difference between Creighton Model, Marquette Method, FEMM, and symptothermal charting?
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.