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An observation chart. A woman ovulates at only one time during her cycle, and an unfertilised ovum can survive for only 12–24 hours. [citation needed] Cervical mucus enabling healthy sperm cells to navigate the genital tract is necessary for fertility.
For avoiding pregnancy, 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% ...
Cervical mucus method may refer to a specific method of fertility awareness or natural family planning: Billings ovulation method; Creighton Model FertilityCare System;
Symptoms-based methods involve tracking one or more of the three primary fertility signs: basal body temperature, cervical mucus, and cervical position. [4] Systems relying exclusively on cervical mucus include the Billings Ovulation Method , the Creighton Model , and the Two-Day Method.
TwoDay method, Billings ovulation method, Creighton Model: 24 (1 in 4) 0.40–4 (1 in 25–250) Behavioral: Observation and charting of basal body temperature, cervical mucus or cervical position: Daily Calendar-based methods [29] The rhythm method, Knaus-Ogino method, Standard Days method: no data: 5 (1 in 20) Behavioral: Calendar-based: Daily
Some methods of NFP track biological signs of fertility. When used outside of the Catholic concept of NFP, these methods are often referred to simply as fertility awareness-based methods rather than NFP. [54] The three primary signs of a woman's fertility are her basal body temperature (BBT), her cervical mucus, and her cervical position. [55]
Other approaches include methods that observe cervical mucus, such as the Creighton Model and Billings method. Cervical mucus's consistency changes during menstrual periods, which may signal ovulation. During vaginal childbirth, the cervix must flatten and dilate to allow the foetus to move down the birth canal. Midwives and doctors use the ...
The World Health Organization considers the rhythm method to be a specific type of calendar-based method, and calendar-based methods to be only one form of fertility awareness. [ 2 ] More effective than calendar-based methods, systems of fertility awareness that track basal body temperature, cervical mucus, or both, are known as symptoms-based ...