Template:Menstrual Parameters table
From Embryology
| 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 |
