Apr 15, 2012 , Michaela Knollová

ket-kryokonzervace.jpg - kopie
ket-kryokonzervace.jpg - kopie
Cryopreservation is a method in which are eggs, sperms and also embryos preserved. All samples are carefully tested for diseases such as HIV or jaundice before cryopreservation and afterwards frozen to -195 °C. The freezing process can be done by either gradual lowering of the temperature or by direct freezing. However, the drain off of samples is necessary before performance of each method. Efficiency of the cryopreserved samples is relatively low, at around 18%, but it is not yet known why it is so.


Cryopreservation is a method in which are eggs, sperms but also whole embryos preserved by deep freeze for future use. Samples that are intended to be frozen are carefully tested in the quality, and for infectious diseases such as HIV and hepatitis B and C. This method is performed by laboratories in centres of assisted reproduction. The way in which will be tissue frozen depends on its type and stage of its development.

Development of eggs and sperms

Development of human sex cells is complex process. Male sex cells are formed in process of spermatogenesis and female eggs are created during the oogenesis. Male sex cells, i.e. sperms, are formed by fission of germ cells which are located in the walls of the convoluted seminiferous tubules. Female sex cells, the eggs, are formed in the ovaries. The origin and development of gametes in men and women is controlled by sex hormones. The follicle stimulating hormone (FSH) and luteinizing hormone (LH) undertake a leading function of this developmental process. Besides them, there are also other hormones produced in the gonads. Oestrogen is produced by the ovaries and testosterone is created in the testes. Germ cells are being divided during their development. The division continues until each cell contains only half of its genetic information. If it comes to fertilization of the egg by sperm in the fallopian tube, the both halves of genetic information will merge and create the embryo.

Indications of cryopreservation

Donated sperms and as well as sperms taken from men who will undergo cytostatic treatment in which might be spermatogenesis impaired can be used for cryopreservation, or sperms which are collected with demanding surgical method from testicle that the new harvest does no not has to be repeated. With regard to the embryos, embryos from donated eggs and extra embryos created in in vitro fertilization (IVF) in which are taken eggs fertilized by collected sperms can be used to cryopreservation. If  there are more fertilized eggs or embryos than it is needed for the transfer to uterus, it is possible to preserve them with Cryopreservation for repeated use.

Process of cryopreservation

Basically, two cryopreservation methods are normally used, i.e. rapid freezing and slow freezing of tissue. During the process of slow freezing, the sample are inserted into the device that gradually reduces its temperature to about -195 °C over several hours. However, the freezing process is not so simple. If there are any water particles left after the freezing process, ice crystals which would destroy the tissue will be formed. Therefore, special substances which drain off the sample are used, for example, propylene glycol. Afterwards, the frozen samples are stored at the temperature of -195 °C which is maintained by cooling with liquid nitrogen. Tissues can be stored for 5 years but on request of infertile couple can be their embryos kept even longer.

Defrosting in cryopreservation

If we want to use cryopreserved samples again, it is necessary to let them thaw. Preservative solutions are gradually washed out from them during defrosting process. Afterwards, it is necessary to determine how severely was sample damaged by deep freeze. The eggs tolerate cryopreservation the worst. Only about 18% of the eggs is suitable for further use after defrosting process. Cryopreservation of sperms and the embryos is far more successful. About 85% of the embryos is successfully cryopreserved. But the question is whether cryopreservation reduces the likelihood of conception or not. Scientists assume that this method has no influence on the probability of success in conception by this way of fertilization. It is true that the number of successfully nidated embryos which were cryopreserved is lower than that of newly developed. This can be explained so that for the cryopreservation are used only embryos of lower quality because the best ones are normally given to patient immediately. For future, it is discussed about possible cryopreservation of ovarian tissue and testes.

Application of cryopreserved sperms and embryos

It is possible to introduce cryopreserved sperms into cervix uteri after the defrosting process. However, we use mainly one of the assisted reproduction techniques. That one is intrauterine insemination (IUI) in which are sperms injected directly into the woman's uterus. Accordingly, the path which must sperms pass to reach the eggs is shortened and the chances of fertilization are greatly increased. Intracytoplasmic sperm injection (ICSI) can be used as alternative method in case of low number and quality of sperms. Sperm of the most quality is carefully selected under a microscope and afterwards injected to the egg which was collected in advance.

Conception difficulties

Developmental disorders related to sex cells are nowadays more and more common. In women, the problem is in the formation and maturation of eggs or in obstructed fallopian tubes. In men, the amount of sperms and their quality is deteriorated. This both unpleasant situations can be caused by hormonal disorders, overcome infectious diseases, previous chemotherapy or radiotherapy and other underlying diseases. If the couple can not conceive naturally within two years, it is advisable to see a doctor and start thinking about methods of assisted reproduction.


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January 16, 2018 11:06 PM

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November 26, 2017 1:18 PM

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Hey guys my wife and I have been married for 15 years. For over five years I have been dealing with jealousy issues because of flirting and her having emotional type affairs with other men. I felt like my masculinity was in question and if I said the way she was acting bothered me, it seemed to make matters worse or I was accused of being controling. During this period I did state I wanted a divorce if the behavior was not going to end: texting men a night, leaving for the weekend without letting me know where she was going or not responding to messages. We do have a son and basically it's been him and I for the last year on the weekends. She disconnected completely from being a good wife and mother. In April she said she wanted a separation and I said no we need to get into marriage counseling. We did try that, but she was not very responsive and didn't give any effort. Afterward she was adamant about separation and divorce. I continued to say no and that we needed to save our family. She presented a separation agreement and I had to hire a lawyer. Because of the above behavior my lawyer suggested a private investigator. The investigator discovered my wife was having an affair with a close friend of the family who also is married with children. We know the extended families. I feel like I should tell this man's wife about what happened. This adultery has devastated me emotionally, I feel betrayed and I'm physically drained. I know my wife is passionate in terms of her sexuality, and I can't get the thought of them out of my head. It makes me question my own manhood, and I feel very inferior or that he must be a better lover or what ever. The problem is my wife pursued him. She would go to him and she lured him into this adultery. I felt this was coming for some time and could not stop it. She was not only lying to me but also to our son about what she was doing and where she was going. My family is important, my son loves her and as crazy as it sounds so do I. Can you respond with a course of action on how to proceed? I was still have a very huge place in my heart for her. so i searched for help online and I came across a website that suggested that Dr Ahmed can help solve marital problems, restore broken relationships and so on. So I felt I should give him a try. I contacted him and he told me what to do and i did it then he did a spell for me. 28 hours later, my wife came to me and apologized for the wrongs she did and promise never to do it again. Ever since then, everything has returned back to normal. I, my son and my wife are living together happily again.. All thanks to Dr Ahmed. as it is a place to resolve marriage/relationship issues, do you want to be sure if your spouse is being faithful to you or Do you want your Ex to come back to you Contact.: E-mail: [email protected] or call/Whats-app: +2348160153829 save your crumbling home and change of grades its 100% safe. I suggest you contact him. He will not disappoint you.
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April 12, 2017 4:26 AM

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September 18, 2016 1:30 AM

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