When the follicle reaches 18x20mm, how long until ovulation occurs?
Nov 15, 2023
Source: Cainiu Health
Dr. Zhao Xiaodong
Introduction
An 18×20mm follicle usually requires another 24–48 hours before ovulation occurs, although the exact timing may vary among individuals. Continued ultrasound monitoring of the follicle is necessary. During this period, increasing the frequency of intercourse appropriately can improve the chances of pregnancy. It is recommended to have intercourse that evening and again every other day, followed by a follow-up ultrasound to confirm whether ovulation has occurred.
Under normal circumstances, ovulation typically occurs 24–48 hours after a follicle reaches 18x20 mm. Detailed explanation is as follows:
A follicle measuring 18×20 mm usually ovulates within 24–48 hours, although the exact timing may vary between individuals. Continued ultrasound monitoring of the follicle is recommended. During this period, increasing the frequency of intercourse appropriately can enhance the chances of pregnancy. It is advisable to have intercourse on the same night and again every other day, followed by an ultrasound examination to confirm whether ovulation has occurred. In women of reproductive age, a cohort of follicles develops each menstrual cycle. Through processes of recruitment and selection, generally only one dominant follicle fully matures and releases an egg. When a cystic follicle grows to a diameter of approximately 1 cm and protrudes toward the ovarian surface, it is considered mature, indicating that ovulation will likely occur within 24–48 hours.
If a woman experiences any discomfort or unusual symptoms, she should promptly seek medical attention at a hospital to avoid delays in diagnosis and treatment.
