Table 4.
Cycle visit schedule by cycle day (based on a 28-day cycle)
| Approximate day of the cycle |
Phase of the cycle | Expected hormonal variation |
|---|---|---|
| 2 | Menstrual | Low E2, low P, low LH/FSH |
| 7 | Mid-follicular | Low E2, low P, low LH/FSH |
| 12 | Late follicular | Peak E2, low P, low/rising LH/FSH |
| 13 | LH/FSH surge | Low E2, low P, peak LH/FSH |
| 14 | Ovulation | Low E2, rising P, decline LH/FSH |
| 18 | Early luteal | Moderate E2, high P, low FSH/LH |
| 22 | Mid-luteal | Moderate E2, peak P, low FSH/LH |
| 27 | Late luteal | Decline E2, decline P, low FSH/LH |
E2, oestradiol; P, progesterone; LH, lutinising hormone; FSH, follicle-stimulating hormone.