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Affiliations
Affiliations
1 Reproductive Endocrinology & Infertility Physician, IVFMD, 7501 Las Colinas Blvd, Suite 200, Irving, Texas 75039
2 Professor and Chairman, Department of Obstetrics and Gynecology, University of Texas Southwestern Medical center at Dallas, 5323 Harry Hines Blvd., J6-114, Dallas, Texas 75390.
Book Affiliations
1 Professor of Medicine Emeritus, University of California, San Francisco, CA
2 Developmental Endocrinology Research Group, University of Glasgow, Glasgow, UK
3 Chief of Medicine at the University of Washington Medical Center and Professor and Vice Chair of the Department of Medicine, University of Washington
4 Sr. Physician Scientist, Washington DC VA Medical Center; Professor of Medicine & Rehabilitation Medicine, Georgetown University; Clinical Professor of Medicine, Biochemistry and Molecular Medicine, George Washington University; and Professor of Medicine (Part-time), Johns Hopkins University
5 Pediatric Endocrinologist and Associate Research Physician in the Skeletal Diseases and Mineral Homeostasis Section, National Institute of Dental and Craniofacial Research, National Institutes of Health
6 Professor of Pediatrics and Endocrinology, Division of Endocrinology, Metabolism and Diabetes, First Department of Pediatrics, National and Kapodistrian University of Athens Medical School, "Aghia Sophia" Children's Hospital, Athens, Greece
7 M.D. Ph.D in Gerontology. Honorary Professor of Medicine, Universidad de Alcalá, Madrid. Consultant in Endocrinology, Hospital HLA Guadalajara (Spain).
8 Professor of Endocrine Oncology, Erasmus MC and Erasmus MC Cancer Center, Rotterdam, the Netherlands
9 Consultant in Diabetes, Endocrinology and General Medicine, Norfolk and Norwich University Hospitals NHS Foundation Trust and University of East Anglia, Norwich, UK.
10 Professor of Medicine, Division of Endocrinology, Diabetes, and Metabolism, Ohio State University
11 Consultant Endocrinologist, Erasmus MC and Erasmus MC Cancer Center, Rotterdam, the Netherlands
12 Consultant Endocrinologist, Department of Endocrinology, Bharti Hospital, Karnal, India
13 Professor of General Medicine-Endocrinology, 1st Department of Propaedeutic Medicine, National and Kapodistrian University of Athens, Athens, Greece
14 Professor of Endocrinology, Department of Endocrinology, Diabetes and Metabolism, Christian Medical College & Hospital, Vellore, Tamil Nadu, India, Melbourne School of Population and Global Health, Faculty of Medicine, Dentistry and Health Science, The University of Melbourne, Australia.
15 Professor, The University of Tennessee Health Science Center, Memphis, Tennessee
16 Professor of Medicine and Chief of the Division of Endocrinology, Diabetology and Metabolism, University of Lausanne, Switzerland
17 Professor of Endocrinology and Metabolism, Centre Lead for Endocrinology and Deputy Institute Director, William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, England
18 University Research Professor and Professor of Medicine (Endocrinology and Metabolism), Obstetrics & Gynecology, and BioMedical Sciences, at Memorial University of Newfoundland in St. John’s, Newfoundland, Canada.
19 Director of the Division of Reproductive Endocrinology at Boston Medical Center and an Associate Professor of Obstetrics and Gynecology at the Boston University School of Medicine
20 Professor of Medicine, New York Nutrition Obesity Research Center, Division of Endocrinology, Department of Medicine, Columbia University Irving Medical Center, New York, NY, USA.
21 Consultant endocrinologist at University Hospitals of Leicester and Honorary Associate Professor at Leicester University
22 Professor of Obstetrics and Gynecology at the University of Vermont and Director of the Division of Reproductive Endocrinology and Infertility. Burlington, Vermont
23 Director of Clinical Research, Hudson Institute of Medical Research; Consultant Endocrinologist, Monash Medical Centre, Melbourne, Australia
24 Allan L. Drash Endowed Chair, Chief, Division of Endocrinology and Diabetes, UPMC Children’s Hospital of Pittsburgh, Professor of Pediatrics and Cell Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA
25 Professor of Medicine, Knight Cardiovascular Institute and the Division of Endocrinology, and Associate Director, Bob and Charlee Moore Institute for Nutrition and Wellness, Oregon Health and Science University, Portland, OR
26 Centro de Investigaciones Endocrinológicas “Dr. César Bergadá” (CEDIE), CONICET-FEI-División de Endocrinología, Hospital de Niños Ricardo Gutiérrez, Gallo 1330, C1425EFD Buenos Aires; and Departamento de Histología, Biología Celular, Embriología y Genética, Facultad de Medicina, Universidad de Buenos Aires, C1121ABG Buenos Aires, Argentina
27 Professor and Head of Department of Endocrinology, Osmania Medical College and Osmania General Hospital, Hyderabad, India.
28 Professor of Pediatrics, The University of Cincinnati, Department of Pediatrics and Cincinnati Children’s Hospital Medical Center, Division of Endocrinology, Cincinnati, OH, USA
29 Director of the Endocrine/Bone Disease Program, Saint Johns Cancer Institute at Saint John’s Health Center, Santa Monica, CA; Clinical Professor of Medicine, UCLA School of Medicine, Los Angeles, CA
30 Professorial Lecturer, Division of Pediatric Endocrinology and Diabetes, Icahn School of Medicine at Mount Sinai, New York, NY. Emeritus Professor and Chair, Department of Pediatrics, University of Pittsburgh.
31 CSO, ELPEN, Inc. & Director, Research Institute, Athens, Greece & Senior Investigator, Human Genetics & Precision Medicine, FORTH (ITE), Heraklion, Greece. Emeritus Scientific Director & Senior Investigator, NICHD, NIH, Bethesda, MD, USA
32 Professor of Medicine, Emeritus, University of Washington, Seattle, WA
33 Endowed Chair, Cardiovascular Health and Risk Prevention, Pediatric Endocrinology and Diabetes, Cook Children's Medical Center, Fort Worth, TX
1 Reproductive Endocrinology & Infertility Physician, IVFMD, 7501 Las Colinas Blvd, Suite 200, Irving, Texas 75039
2 Professor and Chairman, Department of Obstetrics and Gynecology, University of Texas Southwestern Medical center at Dallas, 5323 Harry Hines Blvd., J6-114, Dallas, Texas 75390.
Book Affiliations
1 Professor of Medicine Emeritus, University of California, San Francisco, CA
2 Developmental Endocrinology Research Group, University of Glasgow, Glasgow, UK
3 Chief of Medicine at the University of Washington Medical Center and Professor and Vice Chair of the Department of Medicine, University of Washington
4 Sr. Physician Scientist, Washington DC VA Medical Center; Professor of Medicine & Rehabilitation Medicine, Georgetown University; Clinical Professor of Medicine, Biochemistry and Molecular Medicine, George Washington University; and Professor of Medicine (Part-time), Johns Hopkins University
5 Pediatric Endocrinologist and Associate Research Physician in the Skeletal Diseases and Mineral Homeostasis Section, National Institute of Dental and Craniofacial Research, National Institutes of Health
6 Professor of Pediatrics and Endocrinology, Division of Endocrinology, Metabolism and Diabetes, First Department of Pediatrics, National and Kapodistrian University of Athens Medical School, "Aghia Sophia" Children's Hospital, Athens, Greece
7 M.D. Ph.D in Gerontology. Honorary Professor of Medicine, Universidad de Alcalá, Madrid. Consultant in Endocrinology, Hospital HLA Guadalajara (Spain).
8 Professor of Endocrine Oncology, Erasmus MC and Erasmus MC Cancer Center, Rotterdam, the Netherlands
9 Consultant in Diabetes, Endocrinology and General Medicine, Norfolk and Norwich University Hospitals NHS Foundation Trust and University of East Anglia, Norwich, UK.
10 Professor of Medicine, Division of Endocrinology, Diabetes, and Metabolism, Ohio State University
11 Consultant Endocrinologist, Erasmus MC and Erasmus MC Cancer Center, Rotterdam, the Netherlands
12 Consultant Endocrinologist, Department of Endocrinology, Bharti Hospital, Karnal, India
13 Professor of General Medicine-Endocrinology, 1st Department of Propaedeutic Medicine, National and Kapodistrian University of Athens, Athens, Greece
14 Professor of Endocrinology, Department of Endocrinology, Diabetes and Metabolism, Christian Medical College & Hospital, Vellore, Tamil Nadu, India, Melbourne School of Population and Global Health, Faculty of Medicine, Dentistry and Health Science, The University of Melbourne, Australia.
15 Professor, The University of Tennessee Health Science Center, Memphis, Tennessee
16 Professor of Medicine and Chief of the Division of Endocrinology, Diabetology and Metabolism, University of Lausanne, Switzerland
17 Professor of Endocrinology and Metabolism, Centre Lead for Endocrinology and Deputy Institute Director, William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, England
18 University Research Professor and Professor of Medicine (Endocrinology and Metabolism), Obstetrics & Gynecology, and BioMedical Sciences, at Memorial University of Newfoundland in St. John’s, Newfoundland, Canada.
19 Director of the Division of Reproductive Endocrinology at Boston Medical Center and an Associate Professor of Obstetrics and Gynecology at the Boston University School of Medicine
20 Professor of Medicine, New York Nutrition Obesity Research Center, Division of Endocrinology, Department of Medicine, Columbia University Irving Medical Center, New York, NY, USA.
21 Consultant endocrinologist at University Hospitals of Leicester and Honorary Associate Professor at Leicester University
22 Professor of Obstetrics and Gynecology at the University of Vermont and Director of the Division of Reproductive Endocrinology and Infertility. Burlington, Vermont
23 Director of Clinical Research, Hudson Institute of Medical Research; Consultant Endocrinologist, Monash Medical Centre, Melbourne, Australia
24 Allan L. Drash Endowed Chair, Chief, Division of Endocrinology and Diabetes, UPMC Children’s Hospital of Pittsburgh, Professor of Pediatrics and Cell Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA
25 Professor of Medicine, Knight Cardiovascular Institute and the Division of Endocrinology, and Associate Director, Bob and Charlee Moore Institute for Nutrition and Wellness, Oregon Health and Science University, Portland, OR
26 Centro de Investigaciones Endocrinológicas “Dr. César Bergadá” (CEDIE), CONICET-FEI-División de Endocrinología, Hospital de Niños Ricardo Gutiérrez, Gallo 1330, C1425EFD Buenos Aires; and Departamento de Histología, Biología Celular, Embriología y Genética, Facultad de Medicina, Universidad de Buenos Aires, C1121ABG Buenos Aires, Argentina
27 Professor and Head of Department of Endocrinology, Osmania Medical College and Osmania General Hospital, Hyderabad, India.
28 Professor of Pediatrics, The University of Cincinnati, Department of Pediatrics and Cincinnati Children’s Hospital Medical Center, Division of Endocrinology, Cincinnati, OH, USA
29 Director of the Endocrine/Bone Disease Program, Saint Johns Cancer Institute at Saint John’s Health Center, Santa Monica, CA; Clinical Professor of Medicine, UCLA School of Medicine, Los Angeles, CA
30 Professorial Lecturer, Division of Pediatric Endocrinology and Diabetes, Icahn School of Medicine at Mount Sinai, New York, NY. Emeritus Professor and Chair, Department of Pediatrics, University of Pittsburgh.
31 CSO, ELPEN, Inc. & Director, Research Institute, Athens, Greece & Senior Investigator, Human Genetics & Precision Medicine, FORTH (ITE), Heraklion, Greece. Emeritus Scientific Director & Senior Investigator, NICHD, NIH, Bethesda, MD, USA
32 Professor of Medicine, Emeritus, University of Washington, Seattle, WA
33 Endowed Chair, Cardiovascular Health and Risk Prevention, Pediatric Endocrinology and Diabetes, Cook Children's Medical Center, Fort Worth, TX
Menstruation is the cyclic, orderly sloughing of the uterine lining, in response to the interactions of hormones produced by the hypothalamus, pituitary, and ovaries. The menstrual cycle may be divided into two phases: (1) follicular or proliferative phase, and (2) the luteal or secretory phase. The length of a menstrual cycle is the number of days between the first day of menstrual bleeding of one cycle to the onset of menses of the next cycle. The median duration of a menstrual cycle is 28 days with most cycle lengths between 25 to 30 days (1-3. Patients who experience menstrual cycles that occur at intervals less than 21 days are termed polymenorrheic, while patients who experience prolonged menstrual cycles greater than 35 days, are termed oligomenorrheic. The typical volume of blood lost during menstruation is approximately 30 mL (4). Any amount greater than 80 mL is considered abnormal (4). The menstrual cycle is typically most irregular around the extremes of reproductive life (menarche and menopause) due to anovulation and inadequate follicular development (5-7). The luteal phase of the cycle is relatively constant in all women, with a duration of 14 days. The variability of cycle length is usually derived from varying lengths of the follicular phase of the cycle, which can range from 10 to 16 days. For complete coverage of this and related topics, please visit www.endotext.org.
Presser, H.B., Temporal data relating to the human menstrual cycle, in Biorhythms and Human Reproduction, M. Ferin, et al., Editors. 1974, John Wiley and Sons: New York. p. 145-160.
Hallberg L., et al. Menstrual blood loss--a population study. Variation at different ages and attempts to define normality. Acta Obstet Gynecol Scand. 1966;45(3):320–351.
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Apter D., et al. Follicular growth in relation to serum hormonal patterns in adolescent compared with adult menstrual cycles. Fertil Steril. 1987;47(1):82–88.
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