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ariability in the ength Menstrua cles Within and een omen vi w the iden  Key Points Introduction ariability in the ength Menstrua cles Within and een omen vi w the iden  Key Points Introduction

ariability in the ength Menstrua cles Within and een omen vi w the iden Key Points Introduction - PDF document

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ariability in the ength Menstrua cles Within and een omen vi w the iden Key Points Introduction - PPT Presentation

Menstrual cycles are counted from the first day of menstrual flow and last until the day before the next onset of menses It is generally assumed that the menstrual cycle lasts for 28 days and this assumption is typically applied when dating pregnanc ID: 28702

Menstrual cycles are counted

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Key Points Introduction is typically applied when dating pregnancy. However, length is considered very irregular. are all very similar. Indeed, our findings of mean cycleVariability in menstrual cycle length appears to begreatest at intervals immediately after menarche andyears in each case. Both intervals are characterised byan increased frequency of both very long and veryshort cycles and, consequently, an increased range of age exhibit considerably less variability, although Follicular and luteal phase lengths… variability of menstrual cycleattributable to follicular phase 1-3 Menstrual cycle lengths vary most widely just after menarche and just before menopauseprimarily as cycles are anovulatory 3,11while luteal phase remains constant to menopause8 1,11 Key Points  1,11,12 1-3 1,11,12 3 8 1,11,12 conception does not occur, the corpus luteumconsistent findings. However, the methods used toassess ovulatory status, the rules used to define therestricted their samples to ovulatory cycles within atechniques including use of the peak day of cervical, urinary hormone analysisaccurate than others (cervical mucus and temperature). The major source of cyclephase, and the increased frequency of very short cyclessmoking and exercise, but these appeared to have nofollicular phase is the source of variation in menstrualbecome the primary oocyte Conclusion in the early, follicular phase of the cycle, while the 1Harlow SD & Ephross SA. Epidemiology of menstruation and itsrelevance to womens health. Epidemiol Rev. 1995; 17(2):265-862Lenton EA, Landgren BM, Sexton L. Normal variation in the lengthof the follicular phase of the menstrual cycle: effect ofchronological age. Br J Obstet Gynaecol. 1984; 91(7):681-43Lenton EA, Landgren BM, Sexton L. Normal variation in the lengthof the luteal phase of the menstrual cycle: identification of the4World Health Organisation. A prospective multicentre trial of theovulation method of natural family planning. III. Characteristics of