Cervical Mucus-Basal Body Temperature (CM-BBT) is a sympto-thermal medical model of Natural Family Planning. The method has its basis in the natural pattern of a woman's menstrual cycle. The menstrual cycle occurs because of certain hormonal activity.
The CM-BBT Method is family planning through the knowledge of two specific body changes that occur in every woman during her menstrual cycle due to this hormonal activity.
The first change that is seen is in the vaginal secretions, or cervical mucus, which indicates that ovulation is pending.
The second change occurs in the body's resting, or basal temperature, which indicates that ovulation has passed.
By observing, charting, and interpreting the changes that occur in the cervical mucus and the body's resting temperature, a couple can determine the fertile and non-fertile days in each cycle. This knowledge allows them to make informed decisions about intercourse as each cycle progresses.
This medically based, highly-effective method allows the couple to determine the woman's changing fertility each day. Depending on the couple's motivation, the CM-BBT method can be used to postpone, avoid, plan or achieve pregnancy.
Continued education, follow up, and support are provided by the CM-BBT professional via mail interpretations and/or phone contact, moving the couple toward self-sufficiency in using the method.