Suggested normal limits for the four main clinical dimensions of menstruation and the menstrual cycle are (1):
clinical dimensions of menstruation and menstrual cycle | Descriptive terms | normal limits (5th-95th centiles) |
Frequency of menses (days) | frequent | <24 |
normal | 24-38 | |
infrequent | >38 | |
regularity of menses (cycle-to-cycle variation over 12 months; in days) | absent | |
regular | Variation +/-2 to 20 days | |
irregular | Variation > 20 days | |
duration of flow (days) | prolonged | >8 |
normal | 4.5-8 | |
shortened | <4.5 | |
volume of monthly blood loss (ml) | heavy | >80 |
normal | 5-80 | |
light | <5 |
Reference:
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