Egg donation. Anonymous egg donation

The most reliable assisted reproduction technique involves eggs (oocytes) from an anonymous donor which, following fertilisation, are transferred to the recipient in order to obtain a pregnancy

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What is egg donation?

Egg donation is currently one of the most effective assisted reproduction treatments available because it means that women who are unable to have children using their own ova can experience pregnancy. In vitro fertilisation treatment (IVF) is performed using the anonymous donor’s ovum which is fertilised using the partner’s semen. The embryos that are generated are transferred to the recipient.

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Egg donation. Anonymous egg donation

First visit

Starting a treatment that uses donated egg cells is a very important decision that must be made with all the necessary information. For this reason, the doctor in charge of your case will provide you with detailed information about possible alternatives and the most relevant aspects of the treatment.

It is crucial that you are provided with detailed information about those aspects having to do with the donor, both as regards legislation and the selection procedures that are required to accept candidates as donors. Fortunately, legislation in Spain is clear, and it offers a legal security framework that allows treatments to be carried out in a simple way.

You will also receive information on the procedures followed to select the best donor for you based on your physical and clinical traits.

On this visit, and once you have agreed to take the treatment and selected a time frame to complete it, you will receive information on the necessary steps to get started. The arrangements to receive the embryos are much simpler than the ones for in vitro fertilization (IVF): they do not include daily injections and the number of visits for ultrasound control is limited. You could receive an approximate start date for the treatment at this moment.

At the end of your appointment with the gynecologist you should meet with your Comprehensive Care Provider to complete all the medical and legal requirements (i.e. to sign consents) and receive prescriptions for the necessary drugs as well as accurate and detailed instructions to use them.

Egg donation. Anonymous egg donation

Designing the treatment and synchronizing

At the moment when you are informed about the treatment that uses donated egg cells and you make the decision to start it there begins a process where all the different departments in Instituto Bernabeu are coordinated to offer you the greatest chances for success and the best personal care.

Egg donation. Anonymous egg donation

Preparing the endometrial cavity to receive the embryo

The endometrium is the “layer” in the uterus where the embryo becomes attached and is subsequently implanted so that pregnancy can happen.

This “layer” should be prepared and synchronized with the embryo. For this reason, drugs need to be administered to send the right signs to the uterus so that its “receptivity” is optimal.

Fortunately, preparation is extremely simple: injections, tests and frequent appointments are not necessary at this stage.

The drugs needed for the treatment are administered orally or transcutaneously (i.e. patches) and have a high tolerance level, as the hormone levels that are sought are very similar to those in women during their natural cycle.

After egg cells have been retrieved from the donor, administration of progesterone begins, normally performed vaginally (eggs). The beginning of the administration of progesterone is extremely important, since it is when the sign for the endometrium to be receptive at the moment of transference is “sent”. In other words, it is what creates the correct synchronization between the embryo and the uterus.

You will receive accurate and detailed written instructions about each and every step for preparation. Even so, the whole of our team is at your disposal, so please do not hesitate to let us know if you have any questions or concerns.

Egg donation. Anonymous egg donation

Selecting the most appropriate egg donor

Aware of the great responsibility that the trust placed on our team entails, we begin a thorough selection of egg donors to guarantee the highest quality and the best results to our patients. Having successfully passed a thorough analysis

(e.g. a psychological evaluation and medical, gynecological and genetic tests) and tested negative for the main illnesses that could be transmitted, the candidate is accepted as an egg donor.

Since, we carry out the study of more than 600 hereditary diseases and since 2020 we have performed to all our donors, at no additional cost, the exome of recessive diseases, allowing us to achieve the analysis of analyzing mutations in 1890 genes, causing more than 2500 of this type of disease. As of today, it constitutes the most complete genetic screening performed on donors of ovules and semen. For these diseases to manifest, it is necessary that both be carriers of the variant mutation in the same gene. Therefore, these studies are only valid if they are contrasted with the DNA of the other parent. The test also allows us to detect X-linked diseases, ruling out donor candidates who may be carriers.

Previously, the recipient patient has informed us about their blood type and their main physical characteristics (weight, height, skin colour, eyes, hair, and so on) and provided a photograph to facilitate the search for physical likeness, if you agree. The law in Spain stipulates that under no circumstances will the identity of the parents or the donor be disclosed. Yet, the results of the medical and gynecological tests and the donor’s age may be disclosed in case they are needed in the future. In addition, the donor’s genetic matter (DNA) is stored for a period of 20 years in case it becomes necessary to carry out an advanced comparative genetic study of the future newborn.

Egg donation. Anonymous egg donation

Stimulating the donor’s ovaries

Stimulation of the donor’s ovaries begins at the same time as the therapy to develop the recipient mother’s endometrium. Stimulation is key to future success. It is important to produce the highest possible amount of oocytes, but it is even more important to ensure their quality.

Recogida ovocitos

Retrieving the donor’s eggs

When the right time has come, the donor is put under sedation in the operating room and her eggs are retrieved. At Bernabéu Institute we guarantee a minimum amount of 8 high-quality oocytes to our patients.

Egg donation. Anonymous egg donation

Sperm capacitation

Simultaneously, the male provides a sperm sample. The sample is capacitated in the laboratory to increase its power to fertilize.

Egg donation. Anonymous egg donation

In Vitro Fertilization

Fertilization is initiated in the Human Embryology Laboratory by joining an oocyte with the male’s sperm, either through the usual IVF procedure (more natural) or the ICSI procedure, whereby a single suitable sperm is injected into the oocyte through a thin needle. This procedure facilitates fertilization in cases of male pathology.

The result of fertilization (day 1 of the embryos’ life) can be seen within approximately 18 hours. At this point the amount of naturally fertilized oocytes, which is the same as the number of embryos, can be determined.

Further information

Egg donation. Anonymous egg donation

Starting to take progesterone

Just like it happens in a woman’s natural cycle, progesterone must be included in the recipient mother’s medication at the time of fertilization. This drug is extremely important, as the fetus will need it during the first months of pregnancy, until s/he produces enough placenta.

Egg donation. Anonymous egg donation

Culturing the embryos

Fertilisation is followed by development in a culture medium that provides everything that is needed for growth. The embryos are assessed during development.

Growth is periodically assessed because not all human embryos reach blastocyst stage.

It is important to keep in mind that not all of them will fertilise and become viable embryos. There will be good and poor quality embryos and others that will simply block.

In our donation cycles, 75% of embryos reach blastocyst stage and 100% of transfers are performed on day 5 or 6.

Transferencia embrionaria

Transferring the embryos

Once the blastocyst stage has been reached, embryo transfer takes place. It is an essential stage during treatment. It entails placing the embryo in the mother's uterus. 

The procedure is performed using an abdominal ultrasound scan. The culture medium containing the embryo is positioned inside the uterus. It is a quick and painless procedure.

The environment is a special one that takes into account how delicate the embryo is.

Embryos that have not been transferred and wish to be preserved, after vitrification, proceed to storage. After identification, they are deposited in an exclusive location in the cryogenic tanks of our laboratories. For complete security, this location is not shared with other samples, nor with other patients, to protect them from potential cross-infection or inaccuracies.

Analítica de comprobación del embarazo

Testing for positive pregnancy

13/14 days after the progesterone medication began, a blood sample is taken from the patient in order to determine if she is pregnant or not. It consists of detecting beta-hCG levels in blood since this hormone is produced by the embryo and passed on to the mother. It is the first measurable sign sent by the embryo.

If the patient is not pregnant, the medical team involved in the course of treatment assesses the causes and decides what steps need to be taken. The patient is given an appointment in order to be able to tell her about the team’s evaluation of the situation.

Ecografía de control correcto de la gestación

Pregnancy ultrasound

If the result of the pregnancy test is positive, the patient has an ultrasound scan around two weeks later. Performing this scan any earlier would lead to confusion and doubts since the results are generally not conclusive at this stage.


What happens if transfer does not take place?

On 3% of egg donation treatments there is no transfer. At Instituto Bernabeu, should this be the case and the male factor is not altered (5 million count and 30% mobility), we offer a new treatment at no cost as a proof of commitment to you.

The most comprehensive analysis of hereditary disorders

We perform the most comprehensive test for the main hereditary disorders (over 600 or 2500 recessive diseases, depending on the test chosen). By doing so, we are safeguarding the health of your future child (genetic compatibility analysis or GCT). The test is performed on all donors at no additional cost. The GCT test is also known as Carrier genetic test (CGT)®  Carriermap®, CarrierDNAinsight® and Recombine®.

Advantages of donating eggs

  • It's the reproductive medicine technique which gives the best results.
  • It does not involve ovarian hormonal stimulation or daily injections to the receptor
  • It does not require anaesthesia or sedation
  • It yields the lowest rates of miscarriage caused by chromosomal abnormalities related to age
  • Undergoing egg donation in Instituto Bernabeu also comes with the assurance of flawless management at each stage of treatment.


Why opt for anonymous egg donation?

Often and for different reasons (e.g. age, hereditary diseases, past surgical operations, and so forth), ovaries lose their ability to produce healthy egg cells. Egg cells are vital for conception. This makes anonymous egg donation necessary, as part of In Vitro Fertilisation treatments.


Egg donation at Instituto Bernabeu

Instituto Bernabeu is a leading egg donation centre in Europe counting with one of the first programmes in Spain. Because of our experience of more than 20 years, the large number of egg cell donations in our repository and the social and cultural status of our donors, we can guarantee that:

  • No waiting times.
  • We will conduct rigorous medical and genetic screenings of donor candidates.
  • We will select the most compatible donor from a medical perspective.
  • We assign an exclusive donor for each receptor, which results in a better quality of egg cells and a higher number for donation. We guarantee an average donation of 11 egg cells and a minimum amount of 8 high quality eggs donated.
  • We will perform a thorough selection of physical characteristics that are similar to the receptor’s.


Duration of egg donation treatment

Egg donation treatment takes between a month and a half and two months. In the first appointment, the course of treatment is designed and synchronised with the donor. The donor is selected taking into account optimum patient compatibility. Ovarian stimulation in the donor is synchronised with endometrial preparation in the mother and, once the eggs have been retrieved, in vitro fertilisation (IVF) is performed. Following transfer, around 10 days go by before a pregnancy test can be done and, 5 days after a positive result, the first ultrasound scan can be performed.


Success rates for egg donation at Instituto Bernabeu

Egg donation. Anonymous egg donationFRESH DONATION
(We synchronise fresh donation, unless the recipient patient wishes otherwise)
Egg donation. Anonymous egg donation

CYCLES OF EGG DONATION WITH EMBRYO FREEZING (an average of 2.3 blastocysts per cycle)

Egg donation. Anonymous egg donationTRANSFERS ON DAY 5-6 (BLASTOCYST)99,9%
Egg donation. Anonymous egg donationEMBRYOS REACHING BLASTOCYST STAGE (including male factor)75%
Egg donation. Anonymous egg donationEGGS DONATEDWe guarantee a minimum of 8 and an average per cycle of 11 (2017)

  • Psychological, physical, gynaecological and fertility evaluations.
  • Complete analyses: blood tests, serology (HIV, hepatitis B and C, syphilis, etc.), karyotype, cytomegalovirus, Fragile X syndrome, alpha thalassaemia, beta thalassaemia and muscular spinal atrophy and nonsyndromic hearing loss (GJB2), electrocardiogram, screening for 10 sexually transmitted diseases.

Carried out on all our egg donors at no cost to the patient. This allows us to identify the presence of up to 555 genetic mutations that cause more than 600 diseases, or 1890 genes that cause over 2500 disorders. Read more

There is also the possibility of contrasting the GCT with the future father to rule out that any future child would suffer from any of them.

  • ICSI (Intracytoplasmic sperm injection)
  • Long-term culture to blastocyst
  • MACS sperm selection
Egg donation. Anonymous egg donationVIABLE PREGNANCY 100% GUARANTEEDOptional (subject to medical criteria). Read more


* Transfer of 1 fresh cycle plus 1 frozen cycle with no PGS/PGT-A/CCS and elective vitrification.

Selection the most suitable egg donor

At Instituto Bernabeu, we perform rigorous and comprehensive screenings of donor candidates, including psychological, clinical and genetic evaluations, in order to maximize the suitability and safety of the procedure:

  1. A psychological evaluation performed by a clinical psychologist. This evaluation includes a personal interview and completing our Psychological Evaluation Questionnaire (EMAE) to evaluate the candidate’s personality.
  2. An evaluation of the candidate’s personal and family history performed by a gynecologist specialized in fertility, and a physical and gynecological examination that shows the candidate’s good state of health and excludes the possibility of a gynecologic pathology.
  3. Chromosomal and genetic studies to rule out the possible presence of hereditary diseases: Karyotype (including chromosomal polymorphisms associated with an increased risk of miscarriage), screening for Fragile X Syndrome,  Thalassemia, Spinal Muscular Dytrophy (SMD) and the study of 552 genes linked to over 600 autosomal recessive diseases and since 2020 testing 1675 genes responsible for over 2500 diseases (GCT: The most comprehensive genetic compatibility test). The future father can take the GCT in parallel to contrast the results with the egg donor in order to avoid transmitting diseases to offspring. In addition, the DNA extracted for genetic testing is stored in a biobank for future testing.

    Screening of the 10 most common sexually transmitted diseases  (chlamydia, gonorrhoea, herpes I and II, trichomonas, Treponema, Mycoplasma hominis and genitalium, ureaplasma, haemophilus).

Find out more about egg donor selection


Donor DNA Repository

Thanks to the donor DNA cryobank driven forward by Instituto Bernabeu since its pioneering launch in 2010, patients who need to make use of donated gametes for their fertility treatment can, at any time, make a request for a genetics study with a view to preventing and adequately treating possible diseases which might affect their children in the future (further to egg donor consent). No extra costs.


Epigenetics and egg donation

Epigenetics is a science based on studying how certain environmental factors and as well as lifestyle habits such as eating, smoking, drinking and exercising in the mother can have an impact on the expressions in certain genes. Evidently, the mother’s habits cannot have an impact on the embryo's genetics but they do influence epigenetic markers. As such, the mother carrying the child also has an impact on the future child’s development and shapes certain genetic expressions. She is not merely a receptacle.


Legal aspects of egg donation

It is worth pointing out the main aspects of Law 14/2006 on assisted reproduction techniques with regards to egg donation. They are explained below:

  1. Egg donation must be altruist and unpaid because one of the fundamental principles of Spanish healthcare legislation is that the human body and its cells cannot be commercialised.
  2. It is also a free and formal contract between the donor and the clinic that has the authorisation to perform the technique. As such, donor selection is the responsibility of the medical team at the clinic.
  3. The essential characteristic is anonymous donation and a personal data and donor identity confidentiality guarantee, both on behalf of the gamete bank and on behalf of the reproduction clinic.
  4. Only in exceptional circumstances when the life or health of the child is in danger can donor identity be revealed and only when revealing that information is absolutely essential.

Access additional information in IB FORUM



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