3-646: The Creighton Model FertilityCare System ( Creighton Model , FertilityCare , CrMS ) is a form of natural family planning which involves identifying the fertile period during a woman's menstrual cycle . The Creighton Model was developed by Thomas Hilgers, the founder and director of the Pope Paul VI Institute . This model, like the Billings ovulation method , is based on observations of cervical mucus to track fertility. Creighton can be used for both avoiding pregnancy and achieving pregnancy. Hilgers describes
6-629: The Creighton Model as being based on "a standardized modification of the Billings ovulation method (BOM)", which was developed by John and Evelyn Billings in the 1960s. The Billingses issued a paper refuting the claim that the CrMS represents a standardization of the BOM. According to the Billingses said that those concepts are two different methods and should not be seen as interchangeable. For avoiding pregnancy,
9-494: The perfect-use failure rate of Creighton was 0.5%, which means that for each year that 1,000 couples using this method perfectly, that there are 5 unintended pregnancies. The typical-use failure rate, representing the fraction of couples using this method that actually had an unintended pregnancy, is reported as 3.2%. For achieving pregnancy, no large clinical trials have been performed comparing ART and NaProTechnology. Only observational one-arm studies have been published so far. In
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