Patient's question:
Primary infertilityDoctor's answer:
At different stages of the mid-cycle, the levels of sex hormones in the blood vary. To analyze whether the levels of sex hormones are normal, it is essential to consider the time of blood draw. Observing ovulation generally involves measuring sex hormone levels at two times: ① Mid-cycle (ovulation period), primarily to observe the presence of an LH peak (>40 U/L) and an E2 peak (400 pg/mL); ② Day 21 of the menstrual cycle (or 7 days before menstruation), primarily to observe progesterone and estrogen levels. P > 5 ng/mL indicates ovulation, P between 6-10 ng/mL suggests ovulation but with luteal phase deficiency, and P > 15 ng/mL indicates normal levels. ③ On day 9 of the menstrual cycle, if FSH and LH levels are 14 mm), the pre-ovulatory follicle grows by 2-3 mm per day. A mature follicle is 18-24 mm (17 mm in a natural cycle, >18 mm with hMG ovulation induction, and >20 mm with clomiphene ovulation induction), located on the surface of the ovary.