Cryopreservation of oocytes, embryos

Cryopreservation of oocytes and embryos is two different methods used in IVF and increasing its success. Let's take a closer look and tell about their main features.

What is the cryoconservation of oocytes?

This method is considered a kind of experimental technology. The thing is that often when it is carried out, the survival rate of oocytes after freezing is very low. In addition, the sex cells, after thawing and placing on nutrient media, can not always be fertilized.

The expediency of this method can be justified only if a woman does not have a sexual partner or is not yet ready to become a mother. In similar situations, this is perhaps the only chance to become pregnant and have a baby. As agents used to freeze oocytes, cryoprotectants such as ethylene glycol and dimethylsulfoxide can act. Cryopreservation of eggs can also be carried out in a similar way . It should be noted that the duration of storage does not affect survival in any way.

Everything depends on the so-called structural complexity of the oocytes. Therefore, before carrying out such a procedure, important selection has a careful selection, which is carried out by examining the oocytes in a special microscope.

According to statistical observations, the survival rate of frozen oocytes is approximately 68%, while the frequency of their fertilization is 48%. If we talk about the frequency of observation of pregnancy for each frozen oocyte, then this was observed in 2% of cases.

What is the cryopreservation of the embryo?

This type of freezing of the biomaterial for the subsequent IVF procedure is more progressive. The thing is that cryopreservation embryos give in much better.

The use of this technique allows the in vitro fertilization procedure to be performed in a single cycle. So, in the event that after the transplantation of the cultured embryo pregnancy does not occur, you can use cryopreserved, and do not cultivate the new on a nutrient medium.

Cryopreservation of embryos has its pluses and minuses. The first can include:

The main drawbacks of this method include the fact that the probability of pregnancy is about 60%, and the survival rate of embryos after their thawing has a large range of oscillations, from 35 to 90%. Given these facts, it is difficult to predict how embryos will be implanted after cryopreservation.