Women ovulate more than once a month: Study (JULY 9, 2003): published by Dr Pierson in Fertility and Sterility.
What did they do?
In the study high-resolution ultrasound scans, which allowed them to see the follicles very clearly, were conducted daily on 68 women over a period of 6 weeks.
What was the previous train of thought on ovulating more than once in a month?
Standard medical science says a woman has a cycle running roughly 28 days in which an egg ripens, is released by the follicle, drops into the fallopian tube, and then is either fertilised or shed during menstruation.
What's it mean?
A Canadian study concludes that many women ovulate more than once per menstrual cycle.
10% of the women studied released two eggs in the same month.
A growth wave of 15 to 20 egg-carrying cells called follicles occurs before ovulation.
100% of the women in the study had at least two of these "waves".
30% of the women had three "waves".
The "waves" don't always lead to ovulation, however.
In the study, within 6 weeks, 50/68 women only ovulated once.
6/68 women ovulated twice.
7/68 women didn't ovulate at all.
Most of those "waves" came after they had ovulated, but some had the potential to ovulate immediately after their menstrual period.
In some cases, follicle development didn't reach the point where the egg would normally be mature enough to release.
The researchers don't know whether the pattern for each woman is constant, or whether it changes from month to month.