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Updated: May 3, 2026

Culture and Co-Culture of Mouse Ovaries and Ovarian Follicles
Published on: March 17, 2015
Lateralization of ovarian follicles
Abdulrahman AlSerri1, Anita Kuriya, Hananel Holzer
1Department of Obstetrics and Gynecology, McGill University, Montreal, Que., Canada.
Background/Aim:
To evaluate a possible lateralization of antral follicle count (AFC) based on the finding that endometriosis, if present, is more commonly found in the left hemipelvis.
Methods:
We evaluated the records of 6,617 baseline ultrasounds conducted at our Reproductive Center between 2007 and 2011 in a university teaching hospital setting. We included all ultrasounds with an AFC of 1 or greater and excluded those with incomplete documentation or with ovarian cyst, including endometriotic cysts (n = 909). The main outcome measure was the comparison of the number of antral follicles between the right and left ovary.
Results:
The number of antral follicles in the right ovary (median 18, range 15-22) was significantly higher than in the left ovary (median 16, range 13-20) among women with polycystic ovaries (PCO, AFC ≥24). Similarly, the number of antral follicles in the right ovary (median 8, range 6-10) was significantly higher than in the left ovary (median 7, range 5-9) in women with no PCO but normal ovarian reserve (AFC 10-23).
Conclusions:
In women with PCO and non-PCO with normal ovarian reserve, the right ovary contains a higher number of antral follicles than the left ovary.
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