Medical Sources & Clinical References
Evidence-Based Health References
The cycle estimates, phase physiological guidelines, normal cycle variances, and symptom correlation models in CycleCipher are referenced against established clinical literature and peer-reviewed guidance from global medical institutions.
Authoritative Clinical Citations
1. American College of Obstetricians and Gynecologists (ACOG)
Committee Opinion No. 651: Menstruation in Girls and Adolescents: Using the Menstrual Cycle as a Vital Sign
ACOG guidelines establishing normal adult menstrual cycle ranges (21 to 35 days, with median duration of 28 days), normal flow duration (typically 2 to 7 days), and identifying irregular variations as indicators of gynecological and metabolic health.
2. National Health Service (NHS UK)
Clinical Reference: Stages of the Menstrual Cycle, Ovulation & Common Symptoms
Comprehensive overview of hormonal fluctuations during the menstrual, follicular, ovulatory, and luteal phases, including physiological symptoms such as dysmenorrhea (menstrual cramps), mood fluctuations, breast tenderness, and fatigue.
View NHS Menstrual Cycle Overview →
3. Mayo Clinic - Women's Health
Clinical Overview: Menstrual Cycle: What's Normal, What's Not
Evidence-based definitions of normal cycle variability, tracking physiological patterns, and understanding reasons for cycle irregularities such as acute stress, travel, exercise, and hormonal transitions.
View Mayo Clinic Clinical Article →
4. World Health Organization (WHO)
Reproductive Health Biomarkers and Family Planning Guidelines
Global standards on natural biological markers of the fertile window, cervical fluid variations, and reproductive health indicators.
View WHO Sexual and Reproductive Health Standards →
5. International Federation of Gynecology and Obstetrics (FIGO)
Normal Menstrual Frequency, Regularity, and Duration Parameters
The FIGO classification systems defining normal menstrual cycle frequency (24 to 38 days) and cycle variation standards for clinical practice.
Non-Diagnostic Medical Disclaimer
CycleCipher is not a medical device, contraceptive instrument, or diagnostic service. The application provides personal cycle logging and statistical estimates based strictly on user-entered historical data. It must never be used to prevent pregnancy or as a substitute for professional clinical advice, gynecological care, or diagnosis. For any questions or symptoms regarding your reproductive health, always consult a licensed medical provider.