embryos

What happens to excess embryos following assisted reproduction treatment?

When in vitro fertilisation treatment commences, one of the aims is to try and achieve an appropriate number of good quality embryos in the laboratory so that the best ones can be selected and transferred. Whilst the Spanish law on assisted reproduction (Law 14/2006) permits transfer of a maximum of 3 embryos per cycle, progress in techniques has meant that […]

2019-03-08T10:01:34+02:008 de March de 2019|0 Comments

Can patients manage embryo and gamete transportation?

Whilst it is not part of the day-to-day routine at reproductive
medicine clinics, it is now increasingly common to have to transport biological
samples (oocytes, semen or embryos) from one clinic to another and even from
one country to another.

There can be several reasons for this such as the following:

– The
couple wishes to continue their treatment in a […]

2019-06-20T08:31:16+02:008 de February de 2019|0 Comments

Safety in the in vitro fertilisation (IVF) laboratory so that errors are avoided

A recent news item generated alarm regarding safety procedures in in vitro fertilisation (IVF) laboratories. On this occasion, a hospital in Utrecht is currently investigating 26 potential cases of confusion as a result of insemination with semen samples from different patients. We say that making mistakes is only natural, but when we are working with gametes and embryos, the error rate must be zero.
This recent news instils fear in patients since they are not familiar with the safety measures present in IVF laboratories. This fear can generate a lack of confidence in the clinic and its staff.  If we take into account that assisted reproduction treatment generates stress, news of this kind increases fears even more and generates even greater stress. […]

2017-03-02T14:30:18+02:003 de March de 2017|0 Comments

Will my frozen embryos survive?

Cryopreservation, or embryo freezing, is an essential part of courses of assisted reproduction treatment since it means that embryos can be preserved in order to be used at a later date and without the passing of time having a negative impact on their viability.
Embryos obtained as a result of in vitro fertilisation (IVF) may be thawed for a number of reasons: […]

2019-06-20T08:32:17+02:009 de February de 2017|0 Comments

Recommendations following embryo transfer

Transfer is undoubtedly one of the most important steps in assisted reproduction treatment.
When the patient steps out of the transfer room, a new beginning takes place and the experience will be totally different to what she has undergone up until that point. The embryos have now been transferred and the countdown to the pregnancy test has begun.
It’s important that patients understand that when they go to the toilet to urinate following embryo transfer, the embryos do not ‘fall out’ nor do they get lost since they are situated inside the uterus, a part of the body which is quite different to the one we use for urinating. […]

2017-02-14T11:52:14+02:001 de April de 2016|0 Comments

Cryopreserved embryos: Does biobank storage time affect their subsequent viability?

It has been almost 30 years since the first pregnancy from cryopreserved embryos was achieved (Trounson and Mohr, 1983). Ever since then, numbers have been steadily growing at biobanks in assisted reproduction centres, mainly due to the optimisation of reproductive treatments. Our goal is to retrieve a satisfactory amount of good quality embryos (one that is enough for a fresh transfer and also for cryopreservation) by means of an ovarian stimulation cycle. These embryos may be used for future pregnancy attempts, although couples can choose to donate them for reproductive purposes, assign them to specific research projects or dispose of them. Yet, general evidence shows that many couples, mainly those that achieve pregnancy in their first fresh attempt, choose to keep them frozen without a specific end or plan in mind for the future. […]

2016-08-04T13:23:29+02:0022 de January de 2016|0 Comments

Vitrification: the cold revolution

Vitrification is generally associated with delaying maternity. It involves preserving eggs at low temperatures so that they may be used in the future. This is, in itself, astounding since it enables gametes to be preserved by means of advanced and ultra-rapid cell freezing so that they may be used sometime in the future. The uses to which this technique may be put are so varied and numerous and have changed the work environment in the most prestigious of fertility clinics to such an extent that experts have no doubts about referring to vitrification as a ‘revolutionary’ procedure.
“We could say that cryopreservation is currently the most important aspect of any assisted reproduction clinic” assures Dr Jorge Ten, head of the Reproductive Biology Operational Unit at Instituto Bernabeu in Alicante. In the words of this expert, this technique “has changed enormously over the last 6 to 8 years”. Vitrification was initially carried out using “slow freezing techniques which caused cell damage” in the oocyte. This cell, “in the case of women, is the largest in the human body and has the greatest content in water. Therefore, when frozen, it produced poorer results due to the formation of ice crystals which damaged its structure”. The ice crystals which formed as a result of the aforementioned slow freezing and the high water content in the cell meant that survival rates were “between 20 and 30%. Almost no oocytes survived”. […]

2016-08-04T13:54:31+02:0028 de October de 2015|0 Comments

Embryonic arrest, why don’t all of my embryos develop equally?

When one starts an in vitro fertilisation (IVF) treatment, one of the most frequent concerns is the number of high quality embryos that can be obtained.

This number is variable and depends on several factors such as the ovarian reserve and gamete quality (egg and sperm). Once the eggs are fertilised, they are considered embryos, which begins after their early division. The embryo division is observed in the IVF laboratory on a daily basis and is key information to determine the embryo quality. The Spanish Association of Reproductive Biology (ASEBIR) establishes a classification according to various observed morphological parameters, which indicate the embryo quality according to their capacity to implant in the womb. […]

2019-06-20T08:33:22+02:002 de December de 2013|0 Comments

Towards a Positive Embryo Transfer

At first glance, the embryo transfer seems to be the quickest and simplest step in the In Vitro Fertilisation (IVF) process. However, it is actually the most critical step in the entire treatment. Successfully overcoming previous hurdles means nothing if the embryo transfer is not done well. This happens if too much time lapses between when the embryo is taken out of the incubator and when it is placed back in the uterus. […]

2016-09-22T12:15:58+02:0019 de August de 2013|0 Comments

Egg donation explained simply

For 21 years, egg donation has been a treatment that Instituto Bernabeu offers to women who need it, which has made it a European reference point for egg donation.

It is the reproductive technique with the highest pregnancy rates, over 60% per cycle. At IB, the overall pregnancy rate after three cycles of treatment is over 90%. […]

2016-09-22T12:21:25+02:0014 de May de 2012|0 Comments
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