What is egg freezing?

Egg freezing, also known as oocyte cryopreservation, is a medical procedure that allows eggs to be retrieved from the ovaries, frozen, and stored for potential use in the future. The goal is to preserve eggs at a younger biological age, when egg quality and reproductive potential are typically higher.

As you get older, the quantity and quality of your eggs naturally declines. Freezing your eggs preserves them at their current age and quality, giving you more options for the future, though it's important to understand that freezing is not a guarantee of pregnancy.

Eggs frozen at 28, for example, are biologically preserved at that age. However, future pregnancy success depends on several factors, including how many eggs were frozen, fertilization rates, embryo development, and uterine factors at the time of pregnancy.

When you decide you're ready to use your eggs, they'll be thawed, fertilized with sperm in a lab, and if a suitable embryo develops, it can then be transferred to the uterus of the person carrying the pregnancy.

Why do people freeze their eggs?

People choose to freeze their eggs for many different reasons, and there's no single "right" one. Some are in a place in their life where they're simply not ready. Perhaps the relationship isn't there yet, your career feels like it needs more time, or it just doesn't feel like the right moment. Others have been told by a doctor that their fertility may be at risk and want to act before that window narrows.

Some of the most common reasons we hear from patients include:

• "I'm not ready yet, but I don't want to feel like the clock is running out" — wanting more time without closing the door on having children
• Facing medical treatment like chemotherapy or radiation that could affect fertility
• A diagnosis like endometriosis or PCOS, or a family history of early menopause, that makes preserving eggs now feel important
• Planning for family-building as an LGBTQ+ individual or couple, where egg freezing is often a key part of the journey
• Wanting the financial or logistical space to feel genuinely ready before starting a family

Whatever the reason, the decision to freeze your eggs is deeply personal and there's no wrong motivation for wanting to preserve your options.

How does egg freezing work?

The process of freezing your eggs typically involves five main steps that take around 4 to 6 weeks from start to finish. It's worth knowing that the stimulation phase in particular requires a meaningful time commitment, with frequent clinic visits alongside the injections.

Consultation and fertility testing

You'll meet your fertility specialist to review your medical history and run tests to get a better idea of your overall reproductive health and your ovarian reserve (how many eggs you have).

Hormone stimulation injections

You'll have daily hormone injections for about 10 to 14 days to stimulate your ovaries to produce multiple eggs during one cycle. Some patients find this straightforward, while others experience side effects like bloating, mood changes, or tenderness around the injection site. Everyone's experience is a little different.

Cycle monitoring appointments

During the stimulation phase, you'll come in regularly for ultrasounds and blood tests, often every few days, to track follicle development and make sure your body is responding well. These appointments are frequent and can feel demanding alongside work or daily life, so it's worth planning ahead.

Egg retrieval

When your eggs are ready, you'll have a minor surgical procedure under sedation or anesthesia. A thin needle guided by ultrasound is used to collect the eggs from your ovaries. Most patients go home the same day, though it's normal to feel some cramping or fatigue afterward.

Freezing and storing your eggs

Your retrieved eggs are frozen in a lab using a flash-freezing technique called vitrification and stored in liquid nitrogen until you're ready to use them. You'll pay an ongoing storage fee for as long as you need.

Does egg freezing guarantee a baby?

No, egg freezing is not a guarantee of having a baby in the future. It does improve your chances of being able to have a biological child when you're older, compared to waiting several years then trying to conceive naturally, but it's important to go in with realistic expectations.

Whether or not you're successful depends on a range of factors, including how old you were when your eggs were frozen, how many eggs you froze, and individual factors at the time of transfer. Eggs frozen under 35 are typically higher quality and tend to have higher success rates, but there are no guarantees at any age.

Common factors that affect the chances of a successful pregnancy include:

• Age of frozen eggs: Younger eggs typically have higher success rates
• Number of eggs frozen: More eggs mean more opportunities at each stage of the process
• Egg quality: This varies between individuals, even at the same age
• Fertilization rates: Some eggs will not fertilize
• Embryo development: Not all fertilized eggs will develop into viable embryos
• Implantation: Not all embryos will successfully implant in the uterus

Freezing a higher number of eggs, especially at a younger age, may improve the chances of a successful pregnancy, but no number eliminates uncertainty entirely.

What age is best for egg freezing?

Egg quality and quantity typically decline with age. Many people choose to freeze their eggs in their late 20s to mid-30s to give themselves the best chance of a successful pregnancy later. Others freeze in their late 30s or beyond, though generally more eggs and more cycles may be needed.

Under 35

Eggs are typically at their highest quality before 35, and success rates for future pregnancy tend to be highest at this age.

35 to 38

Egg quality may have started to gradually decline, and you'll likely need to freeze more eggs to achieve a similar chance of a successful pregnancy. More than one cycle may be needed to reach your target number.

39 to 40

Around this age, the quality and quantity of eggs typically starts to decline more rapidly. Egg freezing is still possible, but more cycles and more eggs are likely needed to achieve comparable results.

After 40

People do freeze their eggs after 40, but fewer eggs may be retrieved per cycle and egg quality is typically lower. Multiple cycles are often required, and the conversation with your specialist about whether it makes sense for your individual situation becomes especially important.

How many eggs should you freeze?

There's no universal target that applies to everyone. The number of eggs worth aiming to freeze depends on two things above all else: your age at the time of freezing, and how many children you're hoping to have in the future.

One of the most widely referenced studies on this topic, Goldman et al. (2017), modelled the estimated number of mature eggs needed to achieve a 75% likelihood of at least one live birth:

• Around age 34: approximately 10 mature eggs
• Around age 37: approximately 20 mature eggs
• Around age 42: approximately 61 mature eggs

It's important to understand these as probabilities rather than guarantees. Not every egg retrieved will be mature, and along the way:

• Some may not survive the thaw
• Some thawed eggs may not fertilize
• Some fertilized eggs may not develop into a transferable embryo

Age plays a significant role too. Younger eggs tend to have higher success rates at each of these stages, which is why someone freezing at 32 may need fewer eggs than someone freezing at 38 to achieve a similar likelihood of a live birth. If you're hoping for more than one child, your target number will likely need to be higher.

Rather than focusing too closely on hitting a specific number, the most useful conversation is one with your fertility specialist, who can factor in your age, ovarian reserve, hormone levels, and family goals to give you guidance that's specific to you.

How much does egg freezing cost?

The cost of egg freezing varies depending on your clinic, location, and how many cycles you need. A typical cycle costs between $10,000 and $15,000, which usually covers monitoring appointments, the egg retrieval procedure, and freezing the eggs. Some clinics price significantly lower, so it's worth comparing options in your area.

There are additional costs to factor in. Medications, which are needed during the stimulation phase, typically add $3,000 to $6,000 per cycle and are often not included in the headline price. Annual storage fees generally range from $500 to $1,000. If more than one cycle is needed to reach your target number of eggs, costs will increase accordingly.

Some clinics are transparent about their pricing on their website, while others will require a consultation with a reproductive endocrinologist prior to providing cost estimates.

It's worth asking your clinic for a full cost breakdown upfront so you have a clear picture of the total investment before you begin.

Is egg freezing covered by insurance?

Insurance coverage for egg freezing varies depending on your health plan, employer benefits, and where you live.

Some insurance plans cover fertility preservation for medical reasons, such as before cancer treatment that could affect fertility. In certain states, insurers are required to provide coverage in these situations. However, elective egg freezing for personal or family-planning reasons is not covered by many standard insurance plans.

Some employers now offer fertility benefits as part of their health plans, which may help cover parts of the process including the procedure, medications, or storage fees. Because coverage varies so widely, it's worth reviewing your specific policy or employer benefits carefully before assuming what is or isn't included.

If you're unsure where to start, the team at Obi can help you understand what your coverage includes and how to make the most of your benefits.

Am I a good candidate for egg freezing or is it too late?

Egg freezing tends to work best when done earlier, but "earlier" means something different for everyone. Generally speaking, the best time to freeze your eggs is when your egg quantity and quality are at their highest, which for most people is in their late 20s to early 30s. That said, many women freeze their eggs successfully in their mid to late 30s, and whether it makes sense for you depends less on your age alone and more on your individual ovarian reserve.

The most common question we hear is some version of "am I already too old?" The honest answer is that age matters, but it isn't the whole picture. A 38-year-old with a strong ovarian reserve may be a better candidate than a 32-year-old with diminished reserve. The only way to know where you stand is through testing.

What tests should you have before deciding?

Before moving forward, your doctor will typically recommend:

• An AMH (anti-Müllerian hormone) blood test, which gives an indication of your ovarian reserve
• An antral follicle count via ultrasound, which shows how many follicles are developing in your ovaries
• A review of your overall reproductive health and medical history

These tests don't predict the future with certainty, but they give you and your doctor a much clearer picture of your current fertility and how urgently acting might matter for you.

How quickly does egg quality decline?

Egg quality begins to decline gradually through your 30s, with the rate of decline accelerating after around 35 and again after 38. This is why timing matters, but it also means that freezing at 36 or 37 is not "too late" for many women. What changes as you get older is that you may need more eggs frozen to achieve the same probability of a live birth, and you may need more than one cycle to reach that number.

Is it still worth freezing after 35? After 38?

For many women, yes. The data from Goldman et al. (2017) shows that while the number of eggs needed increases significantly with age, a meaningful chance of a future live birth is still achievable for women in their late 30s who freeze enough eggs. After 40, the picture becomes more complex and the conversation with your specialist becomes especially important before committing to the process.

The most useful thing you can do if you're unsure is get the baseline tests done. They're low-commitment, relatively straightforward, and will give you the information you actually need to make the decision.

Should I freeze eggs or embryos?

This is one of the most common questions people have when exploring fertility preservation, and the right answer genuinely depends on your situation.

Freezing eggs means preserving unfertilized eggs, giving you full autonomy over what happens to them in the future. You're not committed to a partner, a donor, or a particular path. For people who are single, not in a relationship they're certain about, or simply want to keep their options open, egg freezing offers flexibility that embryo freezing doesn't.

Freezing embryos means fertilizing your eggs with sperm before freezing, either from a partner or a donor. Embryos are generally considered more stable through the freeze-thaw process than unfertilized eggs, and for people who already have a known sperm source and are confident in their path, embryo freezing can offer slightly higher success rates per frozen unit.

The decision becomes more complicated when a relationship is involved. Embryos created with a partner's sperm are typically subject to both parties' consent for future use, which can create legal and emotional complexity if the relationship changes. It's worth understanding this before making the decision.

A few things worth considering:

• If you're single or unsure about your future partner, egg freezing preserves your autonomy
• If you have a confirmed partner or sperm donor and are confident in your path, embryo freezing may offer a marginally higher chance of success
• Some people choose to fertilize some eggs and freeze others unfertilized, creating a split approach
• Laws and clinic policies around embryo ownership and consent vary, so it's worth asking your clinic about this specifically

Neither option is universally better. The most important thing is making the choice that fits your current life and the future you're planning for.

What are the risks of egg freezing? Will it affect my fertility later?

Egg freezing is generally considered a safe procedure, but like any medical process it carries some risks that are worth understanding before you begin.

The most common side effects occur during the stimulation phase. The hormone injections can cause bloating, mood changes, breast tenderness, and general discomfort. These are temporary and typically resolve after the retrieval.

A small number of patients develop ovarian hyperstimulation syndrome (OHSS), a condition where the ovaries over-respond to the hormone stimulation and become swollen and painful. Mild OHSS is relatively common and usually resolves on its own. Severe OHSS is rare but can require medical attention. Your clinic will monitor you closely during stimulation specifically to catch any signs of this early.

The egg retrieval procedure itself carries a small risk of bleeding, infection, or injury to surrounding structures, though serious complications are uncommon.

Will egg freezing affect my future fertility?

This is one of the most frequently asked questions and the reassuring answer is that the current evidence suggests it does not. The eggs retrieved during a freezing cycle are eggs that would have been lost naturally during that cycle anyway. You are not depleting your reserve by freezing. Your remaining fertility is not diminished by the process.

It's also worth knowing that the stimulation medications used are not cumulative in the way some people fear. They work within a single cycle and do not have a lasting effect on your hormonal health or future cycles.

As with any medical procedure, it's worth having an open conversation with your specialist about your individual health history and any specific concerns you have before proceeding.

What if I never use my frozen eggs?

It's a question worth considering, because statistically a meaningful number of people who freeze their eggs will never use them. Some will conceive naturally. Some will decide not to have children. Some will find that by the time they're ready, their circumstances have changed in ways they didn't anticipate.

This doesn't make freezing the wrong decision. For many people the value of egg freezing is less about the eggs themselves and more about the peace of mind of having options. Knowing the door isn't closed can meaningfully reduce the anxiety of navigating your 30s without a clear family plan.

That said, it's worth going in with clear eyes about a few practical realities.

Storage fees are ongoing. At roughly $500 to $1,000 per year, eggs stored for a decade represent a real financial commitment on top of the initial cycle cost. It's worth thinking about how long you're realistically planning to store them and what you would do if your circumstances changed significantly.

Clinics will typically ask you to make decisions about your eggs if you move, if a clinic closes, or at certain renewal points. It's worth understanding your clinic's policies upfront and having a plan in mind.

If you decide you no longer want your frozen eggs, most clinics offer several options: continued storage, compassionate transfer, donation to another patient, donation to research, or disposal. These are personal decisions and there's no universally right answer, but it's worth knowing they exist.

The emotional dimension of this question is real too. Some people feel a quiet grief about eggs they stored with hope but never used. Others feel only relief that they had the option, even if they didn't need it. Both responses are completely valid.

What happens when you're ready to use your frozen eggs?

When the time comes to use your frozen eggs, the process typically begins with a consultation with your fertility specialist to review your health, discuss your goals, and map out the next steps. From there, the process moves through several stages.

Thawing

Your eggs will be thawed in the lab, usually on the same day they're needed. Not all eggs will survive the thaw, which is one of the reasons the number you freeze matters. Vitrification, the flash-freezing technique used by most clinics today, has significantly improved survival rates compared to older slow-freeze methods, but some loss at this stage is still normal and expected.

Fertilization

Surviving eggs are fertilized using a technique called intracytoplasmic sperm injection (ICSI), where a single sperm is injected directly into each egg. This is the standard approach with frozen eggs as it gives the best chance of successful fertilization.

Embryo development

Fertilized eggs are monitored over the following five to six days to see which develop into blastocysts, the stage at which embryos are typically considered ready for transfer or further testing. Not all fertilized eggs will reach this stage, which is normal.

Genetic testing

Some people choose to have their embryos tested for chromosomal abnormalities before transfer, a process called preimplantation genetic testing (PGT). This is optional but can help identify the embryos most likely to result in a successful pregnancy, particularly for those who froze eggs at an older age.

Embryo transfer

A suitable embryo is transferred to the uterus, typically in a relatively straightforward procedure that doesn't require general anesthesia. The weeks following transfer involve monitoring to see whether the embryo has implanted successfully.

It's worth knowing that not everyone who returns to use their eggs will end up with a baby. The process involves multiple stages, each with its own success rates, and outcomes depend on the number and quality of eggs originally frozen, age at freezing, and individual factors at the time of transfer. Going in with a clear understanding of the process and realistic expectations makes the experience easier to navigate, whatever the outcome.

What fertility doctors wish women knew about egg freezing

If there's one thing that comes up repeatedly in conversations with fertility specialists, it's this: the women who feel most at peace with their decisions, whatever they turn out to be, are the ones who got informed early enough to actually have a choice.

Here are some of the things doctors most wish patients knew before coming through the door.

Egg freezing is not a guarantee

The technology is genuinely remarkable and has given many people a real path to parenthood they wouldn't otherwise have had. But it works better for some people than others, and going in with realistic expectations is not pessimism. It's the foundation of a decision you can actually stand behind.

Regret tends to run in one direction

In clinical experience, the regret that stays with people is rarely "I wish I hadn't frozen my eggs." It's more often "I wish I had done it sooner" or "I wish someone had told me earlier that this was something I should think about." That asymmetry is worth sitting with if you're on the fence.

Your OBGYN is a good place to start, but not always the end of the conversation

Many women first raise fertility questions with their OBGYN, which is exactly right. But OBGYNs may not specialize in egg freezing, and that's where a reproductive endocrinologist comes in. If you have questions, it's worth asking directly for a referral if you feel you need one.

The testing is low-commitment, even if the decision isn't

Getting your AMH tested and having a baseline ultrasound is not the same as committing to a cycle. It just gives you information. Many women put off even the initial conversation because it feels like a big decision, when in reality understanding where you stand costs very little and changes everything about how clearly you can think it through.

You don't have to be sure you want children to consider it

Some of the best candidates for egg freezing are people who genuinely don't know yet whether they want children. Preserving options while you figure that out is a completely valid reason to go through the process.

Why don't more women freeze their eggs? 

Egg freezing has never been more accessible in terms of technology. And yet for many women, particularly those outside major cities, those without generous employer benefits, or those who simply weren't told about it at the right time, it remains out of reach. That gap between what's possible and who can actually access it is worth naming directly.

Cost and the illusion of transparency

The headline price of a cycle rarely tells the full story. Medications, monitoring, anesthesia, storage, and the possibility of multiple cycles can push the true cost significantly higher than what's advertised. For most women paying out of pocket, egg freezing represents a substantial financial commitment that requires real planning. The lack of standardized, upfront pricing across clinics makes it harder to compare options or prepare adequately. Women deserve clear, complete cost information before they begin, not partway through.

Access outside major cities

The monitoring required during a stimulation cycle, typically multiple ultrasounds and blood draws over 10 to 14 days, assumes you live close to a clinic. For women in rural or suburban areas, or in parts of the country with limited fertility clinic coverage, this alone can make egg freezing logistically impossible without taking significant time off work or incurring travel costs on top of everything else. The geography of fertility care in the US is deeply uneven, and it shapes who gets to make this choice.

Fragmented care between OBGYNs and REIs

For most women, their OBGYN is their primary point of contact for reproductive health. But egg freezing falls under the remit of reproductive endocrinologists (REIs), a separate specialty that many women don't interact with until they're already struggling to conceive. The handoff between these two worlds is often slow, inconsistent, or doesn't happen at all. Women who might have benefited from a conversation at 32 sometimes don't get referred until 38, not because their doctor didn't care, but because the system isn't set up to make that connection proactively.

Delayed referrals and the cost of waiting

Referrals to fertility specialists often come reactively rather than preventatively. A woman trying to conceive who isn't successful after several months may eventually be referred for evaluation. But a woman in her early 30s who isn't yet trying, and simply wants to understand her options, may not be offered that same pathway. The result is that the women who could benefit most from early information are often the last to receive it.

Lack of awareness and education

Many women arrive at the egg freezing conversation later than they'd like simply because no one told them earlier that it was worth thinking about. Fertility education in most healthcare settings remains reactive and crisis-driven. The biology of egg quality decline, the window in which freezing is most effective, and the existence of testing that can tell you where you stand are not routinely discussed at annual appointments. Closing that gap is not just a clinical opportunity. It's an equity issue.

What needs to change

Earlier, more proactive conversations between OBGYNs and patients about fertility options. Clearer and more standardized pricing across clinics. Expanded telehealth options to reduce the monitoring burden for patients who don't live near a clinic. Broader insurance coverage that doesn't limit fertility preservation to cancer patients. And a cultural shift that treats egg freezing as a legitimate part of reproductive healthcare, not a luxury or a last resort.

Women shouldn't have to fight through fragmented systems, opaque pricing, and geography to access information and care that could meaningfully change their options. If you’re thinking about freezing your eggs, the team at Obi can help talk through your options.

This content is for educational purposes only and is not medical advice.