The Use of NFP When Pregnancy Is Contraindicated?

The Sacred Congregation for the Doctrine of the Faith has declared the moral liceity of hysterectomy when certain medical criteria are met but does not exclude other options, "for example, recourse to infertile periods or total abstinence." Consequently, there may be couples who prefer to use natural family planning (NFP) methods. We shall refer to these in this article. The efficacy of NFP methods is determined by knowing the day of ovulation. To that end, three parameters are used: the presence and consistency of cervical mucus, measurement of the basal body temperature, and the determination of particular hormones in urine. Of the NFP methods used, the so-called sympto-thermal method seems to be the most effective. It has been concluded that the postovulatory or luteal phase of the female menstrual cycle is the safest time to avoid pregnancy if the couple has sexual intercourse during this period. Nevertheless, the use of NFP methods has limitations if the length of the cycles varies, there are fluctuations in the basal temperature, or when there are vaginal infections. Urinary hormone levels can also be altered by the use of antibiotics or psychotropic drugs. In general, however, it can be concluded that NFP methods, if used in the conditions mentioned herein, offer a high degree of reliability, similar to that of artificial contraceptive methods. Accordingly, if pregnancy must be avoided in the medical circumstances to which the Congregation for the Doctrine of the Faith refers, NFP methods can effectively replace hysterectomy, thereby circumventing the medical difficulties of this practice. SUMMARY: The Sacred Congregation for the Doctrine of the Faith has declared the moral liceity of hysterectomy when certain medical criteria are met but does not exclude other options, "for example, recourse to infertile periods or total abstinence." Consequently, there may be couples who prefer to use natural family planning (NFP) methods. We shall refer to these in this article. In general, it can be concluded that NFP methods, if used in the conditions mentioned herein, offer a high degree of reliability, similar to that of artificial contraceptive methods. Accordingly, if pregnancy must be avoided in the medical circumstances to which the Congregation for the Doctrine of the Faith refers, NFP methods can effectively replace hysterectomy, thereby circumventing the medical difficulties of this practice.