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The x-axis shows the time of the menstrual cycle in days. The time scale starts with the beginning (or "onset") of (last) menstrual period (LMP), given as day number. Day number 1 corresponds to 0 to 0.99 days from LMP, and Day number 2 corresponds to 1.00 to 1.99 days from LMP and so forth.
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This image is a derivative work of the following images: File:MenstrualCycle_en.svg licensed with Cc-by-sa-2.5, Cc-by-sa-3.0-migrated, GFDL 2011-02-25T14:24:59Z A7N8X 580x775 (67158 Bytes) Reverted to version as of 20:29, 23 March 2008 more common and more detailed version
The sole manufacturer is a US for-profit company, Cycle Technologies [1]. The Standard Days Method is based on the fact that there is a fertile window during a woman's menstrual cycle which begins several days before ovulation and ends a few hours after ovulation. During this time a woman can become pregnant.
In many circumstances, menstrual intervals are prolonged, reaching 35–180 days (oligomenorrhea) or even longer . In other cases, menstruation may be fairly regular ( eumenorrhea ), more frequent (intervals of less than 21 days) or there may be a loss of menstrual pattern ( menorrhagia , dysfunctional uterine bleeding ).
FSH secretion begins to rise in the last few days of the previous menstrual cycle, [3] and is the highest and most important during the first week of the follicular phase [4] (Figure 1). The rise in FSH levels recruits five to seven tertiary-stage ovarian follicles (this stage follicle is also known as a Graafian follicle or antral follicle ...
Calendar rules may set a standard number of days, specifying that (depending on a woman's past cycle lengths) the first three to six days of each menstrual cycle are considered infertile. [31] Or, a calendar rule may require calculation, for example holding that the length of the pre-ovulatory infertile phase is equal to the length of a woman's ...