When chorionic gonadotropin is used to promote follicle maturation, 
high-dose injection is required to simulate the pre-ovulation luteinizing 
hormone peak, thereby accelerating follicle maturation and inducing ovulation. 
Most cases ovulate 36 to 48 hours after injection. 

      If conditions permit, use 
B-ultrasound to monitor follicular development. If artificial insemination or 
ovulation-triggered guided sexual intercourse is performed, it should be 
performed on the day of chorionic gonadotropin injection and/or on the second 
day, and B-ultrasound will be performed again 48 hours later to find out whether 
ovulation has occurred. If there is still no ovulation, it is necessary to 
repeat the injection of chorionic gonadotropin, and repeat the guidance of 
timely sexual intercourse to improve the pregnancy rate.
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