Template:Menstrual Parameters table

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Menstrual Parameters
Clinical dimensions of menstruation and menstrual cycle   Descriptive terms Normal limits (5th - 95th percentiles)
Frequency of menses (days) Frequent < 24
Normal 24 - 38
Infrequent > 38
Regularity of menses (days)
(cycle to cycle variation over 12 months)
Absent
Regular Variation ± 2 to 20 days
Irregular Variation greater than 20 days
Duration of flow (days) Prolonged > 8.0
Normal 4.5 - 8.0
Shortened < 4.5
Volume of monthly blood loss (ml)[1] Heavy > 80
Normal 5 - 80
Light < 5
  1. Hallberg L, Högdahl AM, Nilsson L & Rybo G. (1966). Menstrual blood loss--a population study. Variation at different ages and attempts to define normality. Acta Obstet Gynecol Scand , 45, 320-51. PMID: 5922481