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Technically speaking, less than 5 milliliters of blood loss during the menstrual cycle is considered "too light,” which equates to roughly one saturated regular pad or tampon a day, says Dr. Purdie.
The average volume of menstrual fluid during a monthly menstrual period is 35 millilitres (2.4 US tbsp) with 10–80 millilitres (0.68–5.41 US tbsp) considered typical. Menstrual fluid is the correct name for the flow, although many people prefer to refer to it as menstrual blood.
Less blood flow may be genetic and, if enquiries are made, it may be found that woman’s mother and/or sister also have decreased blood flow during their periods. Pregnancy can normally occur with this type of decreased flow during the period. The incidence of infertility is the same as in women with a normal blood flow.
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 average cycle lasts 28 days, but that number varies from one person to the next. Some people regularly have a cycle that spans only 21 days while others have a 35-day cycle.
Small blood clots—say, dime- or nickel-sized on your heaviest flow days—may appear during menstruation and that’s not uncommon, especially if you feel fine otherwise and you’re not ...
Flow rates vary. On average, about 30mL of menstrual fluid is lost per month; 10 to 35mL is normal. [88] Menstrual blood loss of more than 80mL per month is considered heavy menstrual bleeding, and grounds for consulting a doctor. [89] [90] [55] The stated capacity of menstrual cup is generally measured ex vivo (outside the body).
Hypovolemia is a massive decrease in blood volume, and death by excessive loss of blood is referred to as exsanguination. [2] Typically, a healthy person can endure a loss of 10–15% of the total blood volume without serious medical difficulties (by comparison, blood donation typically takes 8–10% of the donor's blood volume). [3]