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The term metrorrhagia is often used for irregular menstruation that occurs between the expected menstrual periods. [9] [10] Oligomenorrhea is the medical term for infrequent, often light menstrual periods (intervals exceeding 35 days). [11] Polymenorrhea is the medical term for cycles with intervals of 21 days or fewer.
Experts say periods can reveal much more about a woman’s health than whether or not she’s pregnant. ... if their cycles are longer than 35 days or shorter than 21 days, they bleed for more ...
A normal menstrual cycle is 21–35 days in duration, with bleeding lasting an average of 5 days and total blood flow between 25 and 80 mL. Heavy menstrual bleeding is defined as total menstrual flow >80ml per cycle, soaking a pad/tampon at least every 2 hours, changing a pad/tampon in the middle of the night, or bleeding lasting for >7 days.
The first day of menstrual bleeding is the date used for the last menstrual period (LMP). The typical length of time between the first day of one period and the first day of the next is 21 to 45 days in young women, and 21 to 35 days in adults. [2] [3] The average length is 28 days; one study estimated it at 29.3 days. [10]
Menstrual cycle The menstrual cycle is a series of natural changes in hormone production and the structures of the uterus and ovaries of the female reproductive system that makes pregnancy possible. The ovarian cycle controls the production and release of eggs and the cyclic release of estrogen and progesterone. The uterine cycle governs the preparation and maintenance of the lining of the ...
Alternatively, a single menstruation cycle may be defined as irregular if it is less than 24 days or more than 38 days. [7] If they are regularly shorter than 21 days or longer than 36 (or 35) days, the condition is termed polymenorrhea or oligomenorrhea, respectively. [8] Additionally, irregular menstruation is common in adolescence. [9]
The mean pregnancy length has been estimated to be 283.4 days of gestational age as timed from the first day of the last menstrual period and 280.6 days when retrospectively estimated by obstetric ultrasound measurement of the fetal biparietal diameter (BPD) in the second trimester. [12]
“Evolutionary theorists posit that mammals with longer gestational periods tend to unconsciously prioritize pregnancy during the shorter days and cooler months, rendering a birth date when the ...