The quality of eggs can be judged by the detection of follicles under ultrasound and the measurement of estrogen. The growth, morphology, size and discharge of follicles can be directly observed under ultrasound. 1. Detection of follicles: If the follicles are observed to be oval in shape under ultrasound, it means that the quality of the eggs is relatively good. If the average diameter of the follicle is observed to be between 1.8 centimeters and 2.2 centimeters, it means that the follicle is mature and of good quality at this time. If the follicles are small, the quality is not good, and even if a pregnancy is conceived, it is more likely to be miscarried later in life. If the follicles are too large, they may become luteinized and not ovulate. 2. Estrogen measurement: The quality of eggs can be judged by the hormones produced by mature follicles, mainly estrogen. Generally speaking, the estrogen produced by a mature follicle should reach 300Pg/mL. If the estrogen is less than 200Pg/mL, it means that the quality of the eggs is not good. The quality of the eggs determines whether a woman can successfully conceive or not. If the quality of the eggs is good, the chances of pregnancy are higher, while if the quality of the eggs is poor, the chances of pregnancy will be much smaller, and even if conception occurs, the pregnancy may be miscarried.