After the follicle puncture, we can see in the lab how many of the ova have been fertilised. With mature ova a conception rate of about 80% is normal (also for the ICSI-method).


In the microscope the fertilised ovum has a nucleus with the motherly and fatherly genotype. These cell-nucleuses melt in the course of the day to one single cell-nucleus: that of the embryo.


Sometimes it happens that in the fertilised ovum three cell-nucleuses are seen. The ovum is then called triploid. In isolated cases the reasons for that cannot be said. It is possible that (with conventional IVF) 2 sperms have penetrated into the ovum. However: Ovum or sperm already had two instead of only one cell-nucleus. From triploided ova no surviving embryo can originate, these ova have to be rejected.

normal befruchtete Eizelle

normal fertilised ovum



triploide Eizelle

triploid ovum


By all normal fertilised ova we do the so-called PN score. Hereby, with small microscopic structures in the cell-nucleuses it is possible to observe the quality of the ovum. Ovum with a very favourable developing prediction are selected and further cultivated to embryos. Others can be cryo-preserved or also rejected. All this is always done in according with the patients.





Further to