Egg and Embryo Freezing in Istanbul: Process, Cost, and Storage
Manar Hegazy
Majd Eddin Khaled
Egg freezing and embryo freezing may sound similar, but they represent two different fertility strategies.
With egg freezing, the ovaries are stimulated, mature eggs are retrieved, and suitable eggs are cryopreserved without fertilization.
With embryo freezing, eggs are first fertilized during IVF or ICSI. Embryos are then cultured and suitable embryos are cryopreserved for future transfer.
The reason for freezing, the information available at the time of freezing, and the future steps therefore differ considerably.
Fertiliv helps international patients coordinate fertility assessment, treatment planning, and communication with appropriate fertility specialists and embryology facilities in Istanbul.
1. What Is the Difference Between Egg and Embryo Freezing?
Egg Freezing
A typical cycle involves:
Ovarian reserve assessment
Ovarian stimulation
Follicle monitoring
Trigger injection
Egg retrieval
Identification of mature eggs
Cryopreservation
No fertilization occurs at this stage.
When the eggs are used in the future, selected eggs are warmed and fertilized, commonly using ICSI, before embryo development begins.
Embryo Freezing
The first stages are similar, but after egg retrieval:
Suitable eggs are fertilized
Embryos are cultured
Development is assessed
Suitable embryos are cryopreserved
Embryos remain stored until future transfer
Embryo freezing therefore provides information about fertilization and early embryo development that is not yet available when unfertilized eggs are frozen.
2. When Might Egg Freezing Be Considered?
Egg freezing may be considered when fertility preservation is medically or personally relevant and the patient meets applicable clinical and regulatory requirements.
Situations may include:
Medical treatment that could damage ovarian function
Surgery that may affect ovarian reserve
Conditions that may threaten future fertility
Selected ovarian-reserve concerns
Preserving unfertilized eggs for potential future use when eligible
An AMH result alone should not determine the decision.
Age or AMH: Which Matters More?
They answer different questions.
AMH and AFC are useful for estimating expected ovarian response and potential egg yield.
Age at egg freezing is more closely related to egg quality and future reproductive potential.
A patient with a good AMH at an older reproductive age may produce several eggs, but a good quantity does not remove age-related effects on egg quality.
Likewise, low AMH does not automatically make freezing pointless. It may mean fewer eggs are obtained in each cycle.
Read IVF with Low AMH and Diminished Ovarian Reserve.
3. How Does an Egg-Freezing Cycle Work in Istanbul?
Before Treatment
Assessment may include:
Age
Menstrual history
AMH
Antral follicle count
Previous ovarian surgery
Ovarian cysts or endometriosis
Medication and general health
The physician then selects a stimulation protocol.
Stimulation and Monitoring
Hormonal injections stimulate multiple follicles.
Monitoring generally includes ultrasound and may include hormone testing.
The final number of frozen eggs cannot be predicted from AMH alone.
There is a difference between:
follicles seen → eggs retrieved → mature eggs → eggs suitable for freezing
Egg Retrieval and Vitrification
Once follicles reach the appropriate stage, a trigger injection and egg retrieval are scheduled.
The laboratory identifies mature oocytes and cryopreserves suitable eggs, commonly using rapid-cooling vitrification.
Could More Than One Cycle Be Needed?
Sometimes.
If the first cycle produces only a small number of mature eggs or the patient aims to bank more eggs, another stimulation cycle may be discussed.
There is no universal egg number that guarantees a future live birth.
Age, mature-oocyte number, and future family goals should all be considered.
4. What Happens When Frozen Eggs Are Used?
When the patient later wants to use the eggs:
The required eggs are removed from storage
They are warmed under laboratory protocols
Surviving eggs are assessed
Suitable eggs are fertilized
Resulting embryos are cultured
Transfer or further freezing is planned
Does Every Frozen Egg Survive Warming?
No.
Modern vitrification has substantially improved oocyte survival, but every egg cannot be guaranteed to remain usable.
Survival is also only one step.
The egg must then fertilize, and the resulting embryo must continue developing.
Frozen egg number should therefore never be translated directly into an expected number of children.
Does Egg Freezing “Stop the Biological Clock”?
The reproductive characteristics of a frozen egg largely reflect the patient's age when that egg was retrieved and frozen.
However, pregnancy occurs at the patient's later age, so maternal age and general health at the time of pregnancy still matter for obstetric care.
5. Why and When Are Embryos Frozen?
Embryo freezing can occur for several reasons.
Extra Embryos After Fresh Transfer
When one embryo is transferred and other suitable embryos remain, they can be frozen for possible future use.
A later transfer may then be possible without repeating ovarian stimulation and egg retrieval.
Freeze-All Strategy
Some cycles intentionally avoid fresh transfer.
The pathway becomes:
stimulation → retrieval → fertilization → embryo culture → freezing
Transfer is then planned in a separate cycle.
Reasons can include:
Endometrial conditions
Ovarian response
Hormonal findings
Medical reasons to postpone transfer
Embryo genetic testing
Freezing After PGT
When embryos undergo biopsy for genetic testing, they are generally frozen while results are pending.
A frozen embryo transfer can then be planned after results are reviewed.
Read IVF with PGT-A and PGT-M in Istanbul.
6. How Are Frozen Embryos Stored, Warmed, and Transferred?
When Are Embryos Frozen?
Embryos can be cryopreserved at different developmental stages depending on embryo development, laboratory protocols, and the treatment plan.
Many modern IVF cycles culture suitable embryos to the blastocyst stage when clinically appropriate.
Is Every Embryo Suitable for Freezing?
No.
The embryology laboratory evaluates factors including:
Developmental stage
Morphology
Developmental progression
Suitability for cryopreservation
The goal is not simply to freeze every embryo regardless of development.
What Happens During Frozen Embryo Transfer?
A later FET cycle generally involves:
Endometrial preparation
Transfer timing
Removing the selected embryo from storage
Warming
Post-warming assessment
Embryo transfer when appropriate
Does Every Embryo Survive Warming?
No laboratory process can guarantee survival for every embryo.
Modern vitrification has improved survival considerably, but an embryo can occasionally fail to survive or may not continue as expected after warming.
A frozen embryo therefore represents a future opportunity, not a guaranteed pregnancy.
7. Storage and Costs: What Should You Clarify?
Before freezing, ask more than:
How much does freezing cost?
Clarify:
What the freezing fee covers
How many storage units are expected
Whether an initial storage period is included
When annual storage charges begin
How storage is renewed
How the facility contacts you
What happens if contact information changes
Which documents are required for future use
What would be needed to transfer material elsewhere
Egg-Freezing Costs
Under the current coordinated plan, an egg-freezing cycle is approximately:
TRY 135,000 cash
with some cryopreservation charges separate, currently including:
First 1–2 storage units: approximately TRY 17,000
Two additional units: approximately TRY 4,500
Annual storage: approximately TRY 12,000
Prices can change, so the current individual quotation should be confirmed before treatment.
Embryo-Freezing Costs
Under current IVF plans:
First 1–2 storage units: approximately USD 450
Every additional two units: approximately USD 125
Later annual storage: approximately USD 320
Frozen embryo transfer is a separate treatment stage.
Read IVF Cost in Turkey 2026.
Can Eggs and Embryos Remain Frozen for Many Years?
Deep cryogenic storage is designed to maintain cells under stable conditions for long periods.
However, the practical storage period also depends on applicable regulations, consent requirements, administrative policies, and continued storage renewal.
Confirm the current storage rules when freezing begins and at each renewal.
8. How Should International Patients Plan Freezing in Istanbul?
Medical and travel planning need to work together.
Before Traveling
Clarify:
Are you freezing eggs or embryos?
Are you eligible for the proposed treatment?
Which tests are required?
When should treatment start?
Which tests can be completed at home?
When should you arrive?
How flexible should the return flight be?
Traveling for Egg Freezing
The visit generally ends after egg retrieval and appropriate recovery, without waiting for embryo development.
However, retrieval day depends on ovarian response and cannot be fixed precisely at the start of stimulation.
Traveling for Embryo Freezing
Embryo freezing requires an IVF pathway involving fertilization and embryo culture.
Treatment must also meet the applicable Turkish legal requirements, including documentation and use of the married couple's own gametes where embryo creation is involved.
If PGT or Later FET Is Planned
Treatment may require two visits:
First visit: stimulation, retrieval, fertilization, possible biopsy, and freezing.
Second visit: endometrial preparation and frozen embryo transfer.
Read Do You Need One or Two Trips to Istanbul for IVF?.
Can Frozen Eggs or Embryos Be Moved Between Facilities?
In some circumstances, yes, provided the sending and receiving facilities can meet the medical, regulatory, and logistical requirements.
Cryopreserved material is not transported as normal luggage.
The process generally requires:
Coordination between laboratories
Identity verification
Required documentation and consents
A specialized cryogenic transport container
Documented chain of custody
Confirmation of receipt
Do not arrange transport until the receiving laboratory has reviewed the material information and agreed to accept it.
9. How Do You Choose Between Egg and Embryo Freezing?
Neither is universally “better.”
Egg Freezing May Be the Relevant Path When:
There is no current plan to create embryos
The aim is to preserve unfertilized eggs
The patient meets medical and regulatory requirements
Embryo Freezing May Be Relevant When:
A married couple is undergoing IVF
Eggs have already been fertilized
Additional suitable embryos remain
A freeze-all strategy is planned
PGT is being performed
Embryo transfer needs to be postponed
The important distinction is that a frozen embryo has already passed through fertilization and some early development, whereas a frozen egg must still survive warming, fertilize, and develop into an embryo later.
Neither option guarantees a future live birth.
What About Age?
For fertility preservation, delay matters because reproductive potential is strongly influenced by age at egg retrieval.
Read IVF After Age 40 in Istanbul.
Conclusion
Egg freezing and embryo freezing are not interchangeable procedures. Egg freezing preserves unfertilized oocytes, while embryo freezing takes place after fertilization and embryo development. The information available at the time of freezing and the steps required for future use are therefore different.
The right strategy begins by asking why fertility preservation is needed, the patient's age and ovarian reserve, whether IVF is already being performed, and whether PGT or delayed transfer is planned. Patients should also understand storage and future-use costs and avoid treating a number of frozen eggs or embryos as a guarantee of pregnancy.
Frequently Asked Questions: Egg and Embryo Freezing in Istanbul: Complete Guide
What Is the Difference Between Egg and Embryo Freezing?
Eggs are frozen before fertilization, while embryos are frozen after fertilization and early laboratory development.
Does AMH Predict Future Success With Frozen Eggs?
AMH is more useful for estimating egg yield, while age at freezing remains highly important for egg quality and future potential.
Does Every Frozen Egg Survive Warming?
No. Modern vitrification provides high survival, but no laboratory can guarantee that every egg will survive or fertilize.
Does Egg Freezing Guarantee a Future Pregnancy?
No. It preserves a future reproductive opportunity but cannot guarantee fertilization, embryo development, pregnancy, or live birth.
Why Are All Embryos Frozen in Some IVF Cycles?
Freeze-all may be used for PGT, endometrial or hormonal reasons, ovarian response, or another medical reason to delay transfer.
Can a Frozen Embryo Be Used Without Another Egg Retrieval?
Yes. When a suitable frozen embryo is available, FET can be planned without repeating ovarian stimulation and retrieval.
Can Frozen Eggs or Embryos Be Moved to Another Facility?
Sometimes, after the receiving laboratory approves the transfer and all medical, regulatory, and transport requirements are completed.