For there to be a reasonable probability of success in the IVF cycle with PGD, it is important to recover a good number of eggs in the follicular puncture. Generally, obtaining 6 or more eggs would be best. On the other hand, if the woman is a low responder, there is little chance that IVF with PGD will be successful.
There is also the option of making cycles of egg accumulation to obtain several embryos from several cycles and to be able to analyze them all together. In this way, the probability of success is increased and the cost of treatment is reduced.