Free printable chart for tracking postpartum/breastfeeding cycles
More Info
Quantitative Hormone Monitoring of the Menstrual Cycle
Collection of research articles exploring hormone monitoring approaches for fertility awareness and reproductive health.
More Info
Characterization of Hormonal Profiles During the Luteal Phase in Regularly Menstruating Women
This study explores how hormone activity changes throughout the luteal phase, identifying three unique stages that help explain variations in fertility patterns.
More Info
Couples' Views of the Effects of NFP on Marital Dynamics
Couples share their experiences using NFP, noting improved communication and relationship quality, along with some common challenges.
More Info
Spiritual Well-Being, Self-Esteem and Intimacy Among Couples Using NFP
This research highlights how using NFP may support a couple’s emotional connection, spiritual life, and confidence in their relationship.
More Info
NFP and Catholic Hospitals: A National Survey
A national overview of how Catholic hospitals provide NFP services, what methods are offered, and the training behind them.
More Info
Characteristics of the Menstrual Cycle After Discontinuation of Oral Contraceptives
This study looks at how the menstrual cycle, including cervical mucus and flow patterns, is affected after stopping hormonal birth control.
More Info
Efficacy of Achieving Pregnancy with Fertility-Focused Intercourse
Compares pregnancy outcomes when couples time intercourse based on fertile signs versus low-fertility days.
More Info
Cohort Efficacy Study of NFP Among Perimenopause Age Women
Investigates how effective NFP is for women ages 40–55 who are looking to avoid pregnancy during the perimenopausal years.
More Info
Effectiveness of a Postpartum Breastfeeding Protocol for Avoiding Pregnancy
Evaluates the success of a Marquette Method protocol specifically designed for breastfeeding women to avoid pregnancy.
More Info
Efficacy of the Marquette Method of NFP
Measures the effectiveness of the Marquette Method for couples using it to avoid pregnancy.
More Info
The Performance of FABM Apps Marketed to Avoid Pregnancy
Reviews a variety of fertility tracking apps to assess which ones are based on evidence-backed NFP methods.
More Info
Effectiveness of FABMs for Pregnancy Prevention: A Systematic Review
A broad review of the best data available on how reliable fertility awareness methods are when used to avoid pregnancy.
More Info
Finding the Fertile Phase: Low-Cost Luteinizing Hormone Sticks Versus Electronic Fertility Monitor
Compares affordable ovulation test strips with the Clearblue fertility monitor to evaluate their accuracy in identifying peak fertility
More Info
Evangelium Vitae
St. John Paul II’s encyclical on the value and inviolability of human life, addressing moral questions including abortion, euthanasia, and contraception.
St. John Paul II’s landmark teaching series on human love, sexuality, and the body, forming the theological foundation for Catholic approaches to sexuality and NFP.
Reflecting the mission of Marquette University, the mission of the INFP is to serve God by contributing to the advancement of knowledge in NFP and by collaboration with the Catholic Church in local, state, national and international NFP programs.
The US Conference of Catholic Bishops (USCCB) on NFP
Provides guidance on Church teaching about Natural Family Planning, plus links to approved methods, educational tools, and resources for couples and instructors.