The eggs taken out by IVF are not necessarily mature, and they may not all be used, and the eggs taken out need to be identified first, whether they have matured, and the immature eggs do not have the ability to fertilize, and then the eggs that are normally fertilized need to be selected, and the eggs that are abnormal and unfertilized cannot be used. Of course, egg retrieval only removes mature eggs from the ovaries for embryo culture, and eggs that have not yet matured will remain in the ovaries and then shrink and disappear on their own. In addition, it is normal for many women to have a difference between the number of eggs retrieved and the number of embryos that are eventually mated.
Egg retrieval may not always be available
Eggs retrieved from an IVF are not necessarily mature and not necessarily usable. You must know that from the egg removal in the test tube to the formation of the embryo, the egg is screened layer by layer, the immature egg and the egg that cannot form a fertilized egg is not usable, the retrieved egg needs to be identified whether it has matured, the immature egg does not have the ability to fertilize, and then it is also necessary to pick out the eggs that are normally fertilized, and the eggs with abnormal fertilization and unfertilized eggs cannot be used;The next step is that after the embryos are formed, they need to be screened in the laboratory layer by layer, and only the embryos that meet the quality standards can be transferred. Therefore, not all eggs taken out can be used, and they are all mature. Egg retrieval may not always be available
IVF egg retrieval only retrieves mature eggs
Egg retrieval is generally not all taken but only mature. In general, egg retrieval only removes mature eggs from the ovaries for embryo culture, while eggs that have not yet matured will remain in the ovaries and then shrink and disappear on their own. In a normal natural ovulation cycle, only one egg is released, and after a woman has undergone ovulation induction**, multiple mature eggs may appear, with an average diameter of more than 16-18mm in follicle size. Therefore, the doctor who performs the egg retrieval will remove these mature eggs and select the best ones to use to improve the quality of the embryos, and can also save the remaining unused embryos for use after the transfer fails.
The number of eggs after egg retrieval is low
In order to get more eggs in the IVF process, the doctor will promote ovulation, ovulation induction** is to induce the development of multiple dominant follicles under the control of drugs, so that the follicles that should be apoptosis and atresia continue to mature, so as to obtain multiple mature oocytes and increase the possibility of pregnancy. Therefore, it is not possible to match as many embryos as there are eggs, but the number of eggs retrieved is generally large, and the success rate of the operation is relatively large. The number of eggs after egg retrieval is low
Tips:
The eggs taken out by IVF are not necessarily mature, and they may not all be used, and the eggs taken out need to be identified first, whether they have matured, and the immature eggs do not have the ability to fertilize, and then the eggs that are normally fertilized need to be selected, and the eggs that are abnormal and unfertilized cannot be used.