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This is more of a medical question and I'm not a physcian. I think Dr Jacobs (Infertility 101 Message Board) would do a better job of answering your question. Please also post your question there. I'll answer it the best I can.
I think the problem is that the ovaries cannot be visualized using a vaginal ultrasound probe. Visualization using the vaginal probe is necessary because the ovarian follicles that contain the eggs are aspirated using a needle attached to the vaginal ultrasound probe. If the physician can't see the ovaries with the vaginal probe, he can't aspirate the follicles to obtain the eggs. The only other way to obtain the eggs is by aspiration of the follicles during laparoscopy. This method was used in the early days of IVF, but because of its requirement for hospitalization, general anesthesia and a general inefficiency in obtaing the eggs, it was abandoned for ultrasound guided, transvaginal follicle aspiration about 20 years ago.
I don't think they are trying to maintain their statistics. We, too, have had to cancel stimulation cycles for the same reason. Poor visualization of the ovaries is usually caused by an ecess of fatty tissue between the posterior vaginal wall and the ovaries. We recommend weight loss for these patients.
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