Women often find that their menstrual status begins to change, and the most common manifestation of this is a decrease in menstrual volume. Generally speaking, after the age of 40, most women do not have as much menstruation as before, and the normal menstrual volume is about 50ml. How to determine poor ovarian function: 1. First, observe the changes in menstrual cycle: for example, menstruation originally occurs once every 28 to 30 days, but the cycle gradually lengthens to once every 2 or 3 months. In some cases, the menstrual cycle is shortened to once every 20 days, and menstrual cycle disorders are also a sign. The amount of menstrual blood is normal but gradually decreases or even disappears, and the period is originally 5-7 days, but the amount decreases to 1-2 days. If menstruation occurs after the age of 18 or 2-3 years after the onset of secondary sexual characteristics, it is also a sign of inadequate ovarian function. For a comprehensive ovarian function assessment, it is recommended to go to the fertility center for relevant tests, including sex hormone tests, AMH, ovulation monitoring, etc. For details, please visit the clinic.