IVF Maths

Dr. Olga Zaytseff, an obstetrician-gynecologist and fertility specialist, the founder of the O.L.G.A. Fertility Clinic:

Dr. Olga Zaytseff

Dr. Olga Zaytseff

Let’s start by defining what exactly we mean by the IVF success in the O.L.G.A. Fertility Clinic. By the IVF success we mean not a completed IVF cycle, not a positive pregnancy test, and not even a clinical pregnancy. By the IVF success we mean the achievement of a live birth. O.L.G.A. Fertility Clinic Offers Livebirth Guarantee Assurance, it works on a baby or money back principle.

Here I will share with you how our knowledge and skills in fertility, biology and genetics help us define prognosis, share risk, and achieve successful birth in many patients, even if they could not have been helped anywhere else. I will also explain how we count the number of IVF attempts with own eggs sufficient for achieving live birth. If the number of expected IVF attempts till live birth is realistic, a package with the fixed number of IVF attempts and money back guarantee of live birth can be offered.

To ensure the IVF success for you, we need to know and understand the reasons of IVF failures and be able to overcome them. 

One of the most common reasons of why IVF does not work lies not in the woman, as many patients wrongly assume and often unfairly blame themselves for, but in the embryo.

     

Embryo: biology and genetics

What kind of an embryo do we need to achieve a successful pregnancy and live birth?

The human species is very complex with many various unique functions. It is not so easy to pass on to the next generation the entire heritage of important genetic information. An egg is a huge cell, visible even to the naked eye. And it contains a huge amount of valuable material! Not surprisingly, accurate cell division is not an easy task for it to complete.

As a result, humans produce a big number of embryos with an abnormal number of chromosomes, which, oddly enough, is the biological norm for our very complex and highly developed species. Embryos with an abnormal number of chromosomes usually stop developing and do not lead to an ongoing pregnancy and live birth. To achieve an ongoing pregnancy and live birth, we need to find an embryo with a normal number of chromosomes.

To find out which embryo has a normal number of chromosomes, and which one has an abnormal number, we need to use a method called PGT-A. PGT-A is preimplantation genetic testing for aneuploidies — a check of embryonic chromosome number prior to the embryo transfer. PGT-A is carried out on the embryos on the 5-6th day of their development, at this stage the embryos are called blastocysts. 

We talk about the morphology and genetics of embryos at our seminars and webinars. We also discuss possible reasons of IVF failures, ways to overcome them, and we answer your questions. Our webinars are free, you are welcome to register and join.

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Embryo: maths

How many embryos do we need to achieve a successful pregnancy and live birth?

In the O.L.G.A. Clinic the live birth rate per one embryo transfer of one blastocyst with a normal number of chromosomes is 49%. This means that out of 100 women who each had one embryo transfer of one blastocyst with a normal number of chromosomes, 49 will give birth.

How many blastocysts with the normal number of chromosomes do we need on average to achieve live birth?

On average, to achieve live birth for each patient we need to have 2-3 blastocysts with a normal number of chromosomes.

How many IVF cycles do we need to find one blastocyst with a normal number of chromosomes?

The number of IVF cycles depends on two main parameters:

A. What does the number of blastocysts per one IVF cycle depend on?

This number depends on: 

  • The number of eggs expected in one IVF cycle in an individual patient;
  • The blastocyst formation rates — the proportion of fertilized eggs that turn into blastocysts in an individual egg and sperm combination.

What does the expected number of eggs per one IVF cycle depend on?

The expected number of eggs in an IVF cycle depends on the woman's egg reserve. Women are born with their individual egg reserve.

Which proportion of the eggs received will successfully get fertilized? Which proportion of the fertilized eggs will turn into blastocysts?

It depends on the potential of each egg + sperm combination, how this genetic material is going to work together. In some egg + sperm combinations every second fertilized egg turns into a blastocyst, in some — one in 5, in some even none.

We talk in detail about the classification and cultivation of embryos at our seminars and webinars, you are welcome to register and join.

Register to our seminar

B. What determines the proportion of blastocysts with a normal number of chromosomes? — The woman's age.

The higher the age of the woman is, the lower the percentage of chromosomally normal blastocysts formed from her eggs will be.

For example, at the age of 35, one out of two blastocysts has a normal number of chromosomes, at the age of 38 one out of three, at the age of 43 — one out of eight.

So, the higher the age is, the more blastocysts we need to find one blastocyst with a normal number of chromosomes.

Let’s remember that to reach a high probability of live birth, we need 2-3 blastocysts with a normal number of chromosomes, as the live birth rate per one embryo transfer of one blastocyst with a normal number of chromosomes in the O.L.G.A. Clinic is 49%.

We come to a rare situation where if quality suffers then quantity can help. 

If, for one reason or another, in an individual woman or couple we expect to receive just a few blastocysts per one IVF cycle so the probability of finding 2-3 blastocysts with a normal number of chromosomes within one IVF cycle is low, we can calculate in advance the number of IVF cycles necessary for this woman or couple to find these 2-3 blastocysts with a normal number of chromosomes.

If the number of these IVF cycles, within which 2-3 blastocysts with a normal number of chromosomes can be found, is foreseeable, we can offer the following conditions: we achieve a live birth within this fixed number of IVF cycles with own eggs or refund 100% of the package’s cost.

Let’s have a look at two examples:

Example №1:

Imagine my patient is 38 years old. At the age of 38, one out of three blastocysts has a normal number of chromosomes. So, I need to receive at least 6 blastocysts to have a chance to find 2-3 blastocysts with a normal number of chromosomes for this patient. But based on her reduced ovarian reserve, I expect her to have no more than 2 blastocysts per one IVF cycle. However, within three IVF cycles I can get these 6 blastocysts. Thus, within three IVF cycles, I have a high probability of achieving a live birth for my patient. So, I can offer this patient 3xIVF Package with Live Birth 100% Money Back Guarantee”.

 If, after analyzing your medical situation, we see that receiving 2-3 blastocysts with a normal number of chromosomes is possible in your case within three IVF attempts with your own eggs, we can offer you 3xIVF Package with Live Birth 100% Money Back Guarantee”. 


Example №2:

Imagine my patient is 35 years old. At the age of 35, one out of two blastocysts has a normal number of chromosomes. So, I need to receive at least 4 blastocysts to have a chance to find 2-3 blastocysts with a normal number of chromosomes. But due to the reduced ovarian reserve, I expect this patient to have no more than 1 blastocyst per one IVF cycle. However, within four IVF cycles, I can get these 4 blastocysts. It means that within four IVF cycles I have a high probability of achieving a live birth for this patient. So I can offer her 4xIVF Package with Live Birth 100% Money Back Guarantee”.

If, after analyzing your medical situation, we see that in order to receive 2-3 blastocysts with a normal number of chromosomes, you will need at least 4 IVF cycles, we can offer you 4xIVF Package with Live Birth 100% Money Back Guarantee”.


If, due to an advanced female reproductive age, reduced ovarian reserve, reduced blastocyst formation rates, or a combination of these factors, the expected number of IVF attempts with own eggs to receive a blastocyst with a normal number of chromosomes is uncountable and unpredictable, we will not be able to offer a money-back guarantee package with a fixed number of IVF attempts with own eggs. But instead, we can discuss such a package with donor eggs or a combined package.


Please see our web page for information about our Live Birth Money Back Guarantee Packages with own eggs, donor eggs, donor embryos or combination →

To discuss your individual situation, calculate the number of IVF attempts with own eggs till live birth and talk about possible alternatives, such as egg donation, embryo adoption or combined packages, please book a consultation with one of our expert doctors.

Before the consultation, we will ask you to provide us with detailed information about your medical history, test results and journals about your previous IVF attempts. This is usually dozens of pages of valuable information!  

We spend around 6-8 hours studying previous documentation of each new patient. This helps us turn the years of previous bad luck into your potential happy future.

The more accurate information about your medical history you give us, the more accurate prognosis and more successful strategy we can offer.

When you come to us, we will be glad to meet you and will make every effort so that in the foreseeable future we achieve our mutual result — a baby in your arms.

Book a free individual consultation

Q&A

Is it a good idea at all to try IVF if you only have one ovary?

It depends on your age and ovarian reserve which can be calculated by AMH and antral follicle count on ultrasound. If your age is less than 44 and you have good ovarian reserve even in one ovary — it has no difference at all. There may be more eggs available in a single ovary of one individual than in both ovaries of another.

Dr. Anna Gusareva


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My AMH level a year ago was 0.808 ng/ML. I retested my AMH level last week and it is 0.148 which is lower than the average AMH of 43 year olds. The average is typically between 0.4-0.6. Is it normal for AMH levels to drop in such a short time naturally?

AMH level can fluctuate but eventually will go down anyhow because it is an indirect measure of the ovarian reserve which can only decline with time. The pace of this decline is individual.

Dr. Anna Gusareva


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We are back to Seminars in December and January to give you even more information, help and support ❤

Dear Friends, Our seminars in October in Copenhagen, Stockholm, Gothenburg and Oslo were attended by more than 300 people. During these seminars they could listen to our former patients sharing their fertility journeys and to the lecture explaining how to shorten time to pregnancy, they were asking questions in open Q&A sessions and were having personal meetings with our leading doctors.

We were also glad to share with all the participants the helpful reading materials to take home. We have put lots of love and thought into these brochures about IVF, egg donation and embryo adoption. We have created them in a very easy to read form so that you can get the information you have been looking for.

We have also shared with our seminar attendees examples of our egg donor catalogues so that you can literally see how much you can find out about our egg donors.

If you are far away from our seminar locations and can not attend, please request our brochures in PDF by our contact form.

Our former patients bring you lots of inspiration and hope, when they share their journeys in our seminars, in our web site and in these leaflets, which I call “postcards from your potential happy future”. This can be your happy future, these "postcards" can change your life.

Parents today, our former patients have been in your shoes some years ago, they have attended these seminars, even no one wished to be there. And their example today helps you regain hope, motivation and energy to be able to follow your dream up and until it becomes a reality.

Many of those dear patients who have attended our seminars in October, have already sent us their journals, have had their online consultations with our doctors and some have already received their package offers and treatment plans and booked their trips to St. Petersburg for early 2023.

We heard from everyone who attended — no one wanted to be there, but no one regretted having joined. In one evening, people could get more information about fertility than they had during years of fertility treatment. And most importantly, they could regain hope, motivation, energy and belief to be able to move forward towards fulfilling their dream ❤

Yes, we will walk by your side and help you in every step ❤

And yes, we are back to Seminars in December and January to give you even more information, help and support ❤


Please register and join, it is free:

🇸🇪 Malmoe, 8 December at 17:00
Elite Plaza Hotel Malmö, Gustav Adolfs torg 49

🇩🇰 Copenhagen, 10 December at 10:30
Hotel Copenhagen Island, Kalvebod Brygge 53

🇸🇪 Stockholm, 12 December at 17:00
Hotel At Six, Brunkebergstorg 6

🇸🇪 Gothenburg, 16 January at 17:00
Elite Park Avenue Hotel, Kungsportsavenyn 36

🇳🇴 Oslo, 18 January at 17:00
Litteraturhuset, Wergelandsveien 29

Seminars are free. Please register and join!

Register Now!


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