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J Obstet Gynecol Neonatal Nurs. 2007 Mar-Apr;36(2):152-60.

Efficacy of cervical mucus observations plus electronic hormonal fertility monitoring as a method of natural family planning.

Author information

1
Institute for Natural Family Planning, Marquette University, College of Nursing, Milwaukee, WI 53201-1881, USA. richard.fehring@marquette.edu

Abstract

OBJECTIVE:

To determine the effectiveness of an electronic hormonal fertility monitor plus cervical mucus monitoring to avoid pregnancy.

DESIGN:

A 12-month prospective clinical efficacy trial.

SETTING AND PARTICIPANTS:

One hundred ninety five (195) women (mean age 29.8 years) seeking to avoid pregnancy with a natural method at 5 clinical sites in 4 cities.

INTERVENTION:

Each participant was taught to track fertility by self-observation of cervical mucus and an electronic monitor that measures urinary levels of estrone-3-glucuronide and luteinizing hormone.

MAIN OUTCOME MEASURES:

Correct- and typical-use unintended pregnancy rates.

RESULTS:

There were a total of 26 unintended pregnancies, 3 with correct use. With 1,795 months of use, the correct-use pregnancy rate was 2.1% per 12 months of use (i.e., 97.9% effective in avoiding pregnancy when rules of the method were always followed) and the imperfect-use pregnancy rate was 14.2% per 12 months of use (i.e., 85.8% effective in avoiding pregnancy when rules of the method were not always followed and all unintended pregnancies and months of use were included in the calculations).

CONCLUSIONS:

Correct use of an electronic hormonal fertility monitor with cervical mucus observations can be as effective as other fertility awareness-based methods of natural family planning. Comparative studies are needed to confirm this conclusion.

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