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WHAT IS CYCLE TRACKING?

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Cycle tracking involves observing and recording daily
observations of biomarkers of fertility.

These external biomarkers serve as
indicators of internal fluctuations
in hormones.

Tracking may be used for health monitoring and/or family planning purposes.

"The Fifth Vital Sign"

"The menstrual cycle — a complex process orchestrated by interactions between many of the body’s tissues, cells, and hormones—reflects a woman’s overall health status and can be thought of as a 'fifth vital sign.' "
National Institute of Child Health and Human Development National Institutes of Health
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Scientifically Sound

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"Fertility Awareness Based Methods ... [have] a sound basis in reproductive biology, a precise protocol for correct use and evidence of efficacy under various conditions based on appropriately designed studies."
World Health Organization
Technical Consultation, 2015

Three Biomarkers

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Cervical fluid observations, basal body temperature tracking, and urinary hormone testing provide the basis for the main types of fertility-awareness based methods.
American College of Obstetrics and Gynecologists
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For More Information

Want to learn about cycle charting?  Click the link below to visit FACTS About Fertility, a nonprofit organization whose mission is to educate medical professionals, students, and the public about cycle tracking.

© 2025 by Dr. Kayla Iuliano.
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